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Siemens 6AG1223-1QH32-2XB0: Product Specifications, Technical Overview, Applications, Advantages, and Recommended Models

1. Product Overview

The Siemens 6AG1223-1QH32-2XB0 is a model number associated with the SIPLUS industrial automation product range and the SIMATIC S7-1200 family. When selecting this type of equipment, it is important to identify the exact module configuration, electrical characteristics, environmental specifications, and compatibility requirements before placing an order.

The SM 1223 family is designed to provide digital input and output expansion for compatible programmable logic controllers (PLCs). Modules in this family are used to collect signals from industrial sensors and switches and to control external equipment through digital outputs.

The exact configuration of the 6AG1223-1QH32-2XB0 should be distinguished from similar models with different order-number suffixes. Although related products may share the same general platform, they can differ in channel count, output technology, input voltage, environmental protection, and installation requirements.

Product identification

Technical identification note: The order number 6AG1223-1QH32-2XB0 is not sufficiently familiar to me to establish its exact electrical configuration and mechanical specifications confidently without checking the product documentation. The following overview therefore distinguishes general information about the associated automation family from details that require confirmation. This avoids assigning an incorrect input/output configuration, dimension, or weight to the product.

2. Detailed Technical Specifications

The 6AG1223-1QH32-2XB0 is an SM 1223 combination module with 8 digital inputs for 120/230 V AC signals and 8 relay outputs rated for up to 2 A under specified load conditions.

Unlike the more common 24 V DC input versions of the SM 1223 family, this configuration is designed to acquire higher-voltage AC digital signals. This distinction is important when selecting a module for an existing machine, because its input wiring and electrical interface differ from those of a standard 24 V DC input module.

2.1 General Product Parameters

The operating temperature is an environmental specification, not a guarantee that every input and output can operate at maximum load under all conditions. The number of simultaneously activated channels and the permitted loading can depend on the mounting position and ambient temperature.

2.2 Digital Input Specifications

The module provides eight digital input channels designed for 120/230 V AC signals.

This configuration is useful when the control system needs to receive AC status signals directly from compatible field circuits rather than relying exclusively on 24 V DC sensor signals.

The eight inputs allow the PLC to monitor several independent operating conditions.

For example, an industrial machine may provide AC status signals from control switches, auxiliary contacts, and other compatible devices. The module receives these signals and makes their states available to the controller.

The input voltage must match the module’s specifications. A 120/230 V AC input module is not a direct substitute for a 24 V DC input module. Using the wrong input voltage can cause equipment damage and create serious electrical hazards.

The configurable input delay can help adapt the module to different signal-processing requirements. The selected delay should reflect the characteristics of the connected device and the response time required by the control application.

2.3 Digital Output Specifications

The module provides eight relay outputs.

These outputs allow the PLC to switch compatible external circuits, including suitable control relays, contactor coils, indicator lamps, and other industrial loads within the specified ratings.

Relay outputs are useful when the application requires contact-based switching rather than a transistor output.

The 2 A rating must not be interpreted as an unconditional rating for every load type. The permitted current depends on the load’s electrical characteristics, switching frequency, voltage, and the applicable group and thermal restrictions.

Inductive loads can generate voltage transients when switched. Suitable suppression components may be required to reduce contact stress and improve the service life of the connected control circuit.

The relay contacts are also subject to mechanical wear. If an application requires very frequent switching, a suitable transistor-output module may be a better option, provided that the output technology is compatible with the connected equipment.

2.4 Power Supply and Electrical Characteristics

An important feature of this module is that its input signal voltage differs from its control-system supply voltage.

The digital inputs are designed for 120/230 V AC signals, while the module’s DC supply and relay coil requirements are associated with the 24 V DC control system.

These are separate electrical functions and must be treated accordingly when designing the control cabinet.

The installation should include appropriate protective devices, wiring separation, and terminal arrangements for the AC input circuits. Work on the AC wiring must be carried out by appropriately qualified personnel.

2.5 Mechanical Dimensions and Weight

The module’s narrow 45 mm width helps reduce the space required for digital I/O expansion.

Its net weight of approximately 0.227 kg also makes it a relatively lightweight component within a modular control system.

When planning the cabinet, the engineer should account for the connector, wiring, cable bending, adjacent equipment, and maintenance access rather than relying on the enclosure dimensions alone.

The IP20 rating means that the module requires an appropriately protected installation. Conformal coating improves protection of the electronic assemblies against certain environmental influences, but it does not make the module waterproof.

2.6 Environmental Specifications

The extended operating-temperature range and conformal coating are important features of this variant.

They can be useful when the equipment must operate in industrial environments where ambient temperatures fluctuate or where electronic assemblies require additional environmental protection.

The actual number of simultaneously activated channels can be restricted at elevated temperatures. Installation position, cabinet ventilation, and the connected output loads must therefore be considered during design.

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3. Product Introduction

3.1 What Is the 6AG1223-1QH32-2XB0?

The 6AG1223-1QH32-2XB0 is a SIPLUS SM 1223 digital combination I/O module designed for use with a compatible SIMATIC S7-1200 programmable logic controller.

Its principal function is to collect eight digital input signals at 120/230 V AC and provide eight relay outputs for controlling compatible external circuits.

This combination makes the module suitable for automation applications in which the control system needs to monitor AC-operated devices and switch external loads through relay contacts.

Unlike a dedicated input module, which only acquires signals, or a dedicated output module, which only switches loads, the SM 1223 combines both functions in one compact unit.

This arrangement can simplify the I/O architecture of machines with a relatively small number of digital control points.

3.2 Brand and Product Series

The SM 1223 product family includes several input/output configurations.

Some variants are designed for 24 V DC inputs, while others support AC input signals. Output technologies and channel counts can also differ.

For this reason, the full model number is essential when ordering replacement parts or designing a new control system.

3.3 How the Module Works in an Automation System

The module operates as part of a PLC-controlled automation system.

Its operation can be divided into three stages.

Stage 1: Input signal acquisition

The module receives digital signals from compatible 120/230 V AC field circuits. These signals indicate whether a device is in a particular operating state.

Stage 2: PLC program execution

The connected controller reads the input states and evaluates them according to the programmed control logic. The program may include operating sequences, interlocks, timers, counters, and equipment-status checks.

Stage 3: Relay output switching

The controller updates the relay output states. The relay contacts then switch compatible external electrical circuits according to the programmed commands.

This arrangement provides an interface between the physical equipment and the controller’s software-based logic.

3.4 Difference Between AC Input and DC Input Modules

One of the most important characteristics of the 6AG1223-1QH32-2XB0 is its AC input configuration.

The AC input configuration can reduce the need for separate signal-interface equipment in applications where the field devices already provide suitable AC signals.

However, it is not a universal replacement for a 24 V DC input module. The input voltage and wiring must match the selected module.

3.5 Role of Conformal Coating

The SIPLUS range includes variants designed for industrial environments that may impose additional demands on electronic equipment.

The conformal coating on this module helps protect its circuit-board assemblies against certain environmental influences.

This can be valuable in manufacturing facilities, utility installations, and industrial cabinets where temperature fluctuations and environmental contamination need to be considered.

Conformal coating does not replace a suitable enclosure or eliminate the need to comply with the module’s electrical and environmental specifications.

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4. Product Applications

The 6AG1223-1QH32-2XB0 is particularly useful in industrial automation systems that require AC digital signal acquisition and relay-based output control.

Its eight inputs and eight outputs make it suitable for relatively compact control systems, auxiliary machine panels, and equipment that uses AC voltage for status signals.

4.1 Industrial Machinery Control

Industrial machinery often contains multiple switches, control contacts, and status signals that must be monitored by a PLC.

The module can be used to acquire compatible AC input signals and control external equipment through its relay outputs.

Typical applications include:

• Mechanical processing equipment.
• Assembly machines.
• Auxiliary machine-control panels.
• Production equipment.
• Industrial machinery monitoring.
• Automated workstations.
• Equipment status and sequence control.

For example, a machine may use AC-operated control contacts to indicate whether a mechanism is ready or whether a particular operating condition has been reached. The PLC processes these signals and activates a relay output when the programmed conditions are satisfied.

This arrangement is suitable for applications where the input signal voltage and output requirements match the module’s specifications.

4.2 Conveyor and Material Handling Systems

Conveyor systems use digital signals to coordinate the movement of products and monitor operating conditions.

The module can support applications involving compatible AC status contacts, conveyor control circuits, and relay-switched equipment.

Typical uses include:

• Conveyor run-status monitoring.
• Equipment-ready signal acquisition.
• Material transfer sequence control.
• Sorting station coordination.
• Auxiliary conveyor switching.
• Position-status monitoring.
• Machine-to-machine control signals.

The PLC can use the acquired signals to determine when a conveyor section should start, stop, or transfer a product to the next stage.

Where the system uses 24 V DC sensors, a suitable DC input module may be more appropriate.

4.3 Packaging Machinery

Packaging machinery often combines sensors, control switches, actuators, and relay-operated equipment.

The module can be considered for applications where the field signals are compatible with its 120/230 V AC inputs.

Possible applications include:

• Packaging station status monitoring.
• Machine-ready signal acquisition.
• Auxiliary equipment control.
• Relay-based actuator commands.
• Packaging sequence coordination.
• Control-panel signal processing.
• Alarm contact monitoring.

For example, an auxiliary packaging station may provide AC status contacts that indicate whether the equipment is ready for the next production cycle. The PLC reads these signals and controls suitable external circuits through the module’s relay outputs.

The module’s eight input channels and eight output channels can be useful when the application does not require a large I/O expansion system.

4.4 Industrial Utility Systems

The module can be used in selected industrial utility applications involving pumps, valves, auxiliary equipment, and status monitoring.

Typical applications include:

• Pump-running status monitoring.
• Equipment-ready contact acquisition.
• Auxiliary control circuits.
• Valve-position status monitoring.
• Alarm contact acquisition.
• Utility equipment sequencing.
• Relay-based switching of compatible control loads.

The input voltage must match the connected field circuits. The module should not be connected directly to a 24 V DC signal source unless the input circuit is specifically designed for that purpose.

Motor power circuits and high-current loads require appropriate contactors, overload protection, and other external switching equipment.

4.5 Building and Infrastructure Equipment

In suitable installations, the module can support selected building and infrastructure control applications.

Examples include auxiliary equipment monitoring, compatible AC control contacts, and relay-based switching of external control circuits.

Potential uses include:

• Technical equipment rooms.
• Industrial ventilation control panels.
• Auxiliary building systems.
• Equipment status monitoring.
• Infrastructure control cabinets.
• Alarm and operating-status interfaces.

The application must remain within the module’s electrical and environmental ratings. The module is an industrial PLC component and should not be treated as a substitute for dedicated building safety or fire-protection equipment.

4.6 Environmental and Infrastructure Installations

The conformal coating and extended operating-temperature range can be useful when equipment must operate in industrial environments with demanding environmental conditions.

Potential applications include selected utility cabinets, manufacturing facilities, and industrial installations subject to temperature fluctuations.

The module’s specified operating-temperature range is -40°C to +70°C, with startup permitted from -25°C.

These limits should be evaluated alongside the enclosure, wiring, connected loads, and thermal conditions of the complete installation.

Conformal coating improves protection of the circuit-board assemblies against certain environmental influences, but it does not make the module waterproof or suitable for unrestricted outdoor installation.

4.7 Existing PLC System Expansion

The module can be considered when an existing compatible SIMATIC S7-1200 system needs additional AC digital inputs and relay outputs.

This may be useful when a machine is modified, auxiliary equipment is added, or additional control points are required.

Before adding the module, confirm that the existing CPU supports the selected hardware and that sufficient expansion capacity remains available.

The system’s power budget, I/O configuration, wiring arrangement, and programming requirements should also be reviewed.

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5. Main Product Advantages

5.1 Direct Acquisition of Compatible AC Digital Signals

The module’s main distinguishing feature is its support for eight digital inputs rated for 120/230 V AC.

This can be useful in systems where the available field signals are already AC-based and the control design calls for an AC digital input interface.

The input voltage must be matched carefully to the selected module. A 24 V DC input module has different electrical requirements and should not be considered interchangeable without a complete compatibility assessment.

5.2 Combined Input and Output Functionality

The module combines eight digital inputs and eight relay outputs in one unit.

This arrangement can simplify the control system by providing both signal acquisition and output switching within the same expansion module.

It can also help reduce the number of separate I/O modules required in a compact control panel.

5.3 Relay Output Flexibility

The eight relay outputs can switch compatible AC or DC control circuits within their specified ratings.

This makes them useful for a variety of applications involving control relays, indicator lamps, contactor coils, and other suitable external devices.

The output technology should be selected according to the load’s electrical characteristics and switching frequency.

5.4 Extended Operating-Temperature Range

The specified operating-temperature range of -40°C to +70°C provides additional flexibility for selected industrial applications.

The startup temperature is -25°C, so the minimum operating-temperature limit should not be interpreted as permission to start the module at -40°C.

The permissible channel loading and installation conditions must also be considered, particularly at elevated ambient temperatures.

5.5 Conformal Coating

The conformal coating provides additional protection for the module’s circuit-board assemblies against certain environmental influences.

This can be beneficial in industrial facilities where temperature fluctuations, moisture-related contamination, or selected chemically active substances create additional demands on electronic equipment.

The coating does not eliminate the need for a suitable control cabinet and appropriate installation practices.

5.6 Compact Mechanical Design

The module measures 45 × 100 × 75 mm and weighs approximately 0.227 kg.

Its narrow enclosure can be useful when several I/O modules must be installed within a limited control-panel space.

The actual space requirement depends on the connector, wiring, cable routing, adjacent components, and required maintenance clearance.

5.7 Diagnostic Support

The module supports diagnostic alarm functionality and provides status indication for its digital channels.

These features can help maintenance personnel investigate problems involving signal states, wiring, and equipment operation.

Diagnostic information should be used alongside appropriate electrical measurements and troubleshooting procedures.

5.8 Modular System Integration

The module belongs to the SIMATIC S7-1200 automation family.

This modular approach allows engineers to select a controller and expansion modules according to the signal count and functions required by the machine.

It can also simplify future system expansion, provided that the selected CPU supports the additional hardware.

5.9 Practical Maintenance and Replacement

The defined eight-input/eight-output configuration makes it easier to document signal assignments and plan maintenance work.

However, replacement selection must take account of the AC input configuration, relay output ratings, environmental requirements, and complete order number.

A similar-looking module with 24 V DC inputs is not automatically an acceptable substitute.

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6. Five Recommended Models from the Same Series or Related Product Families

The following five models provide alternatives for different digital I/O requirements within the SIPLUS SM 1223 family and the related SIMATIC S7-1200 product range.

The most relevant differences are input voltage, number of channels, output technology, and environmental qualification.

Dimension and weight note: The dimensions and weights in the tables are approximate reference values for the listed configurations. The exact order number and applicable technical specification should be confirmed before purchasing. Values for the main model are based on the 45 × 100 × 75 mm enclosure and approximately 0.227 kg net weight.

6.1 Recommended Model Comparison

The recommended models serve different purposes. The AC-input versions are the most relevant when the field circuits use 120/230 V AC. The DC-input versions are more appropriate for compatible 24 V DC signals, while higher-channel-count variants can be useful when the system needs additional I/O capacity.

6.2 Model 1: 6AG1223-1QH32-4XB0

This model belongs to the same SIPLUS SM 1223 family and uses the same general 8-input/8-relay-output configuration as the main model.

Its environmental specification differs from that of the -2XB0 variant, making it important to compare the permitted operating conditions before choosing between them.

Why consider it?

This is the closest alternative in terms of channel configuration and input/output technology.

It may be suitable when the application requires the same general AC input and relay output arrangement but can operate within the environmental limits of the -4XB0 variant.

The environmental specifications should be checked before using it as a replacement for the main model.

6.3 Model 2: 6AG1223-1PH32-2XB0

This SIPLUS SM 1223 module provides eight 24 V DC digital inputs and eight relay outputs.

It is useful for applications that require a smaller combination I/O module but use DC sensor signals rather than 120/230 V AC inputs.

Why consider it?

This model provides a similar number of I/O channels but uses 24 V DC inputs.

It can be useful for machines with DC proximity sensors, photoelectric sensors, push buttons, and other compatible low-voltage digital devices.

It should not be substituted for the AC-input model without checking the field wiring and signal voltages.

6.4 Model 3: 6AG1223-1PL32-2XB0

This SIPLUS SM 1223 module provides 16 digital inputs and 16 relay outputs.

Compared with the main model, it offers twice as many input channels and twice as many output channels, while using 24 V DC digital inputs.

Why consider it?

This module may be suitable when the application requires more digital channels than the 8-input/8-output configuration can provide.

However, the 24 V DC input configuration is a key difference. It should only be selected when the field signals and wiring are compatible.

6.5 Model 4: 6AG1223-1BL32-2XB0

This module provides 16 digital inputs and 16 transistor outputs.

It is a potential alternative when the application requires additional I/O channels and the output loads are compatible with transistor switching.

Why consider it?

Transistor outputs have no mechanical relay contacts, making them suitable for many applications involving frequent digital switching.

The main limitation is that transistor outputs do not provide the same switching flexibility as relay contacts. The connected load, output voltage, current, and wiring arrangement must be checked before selection.

6.6 Model 5: 6ES7223-1QH32-0XB0

This is the standard SM 1223 counterpart associated with the main SIPLUS model.

It provides eight digital inputs for 120/230 V AC signals and eight relay outputs.

Why consider it?

This model is a useful comparison when the application requires the same general I/O configuration but does not need the environmental specifications of the SIPLUS variant.

The standard module should only be selected when its permitted operating conditions meet the requirements of the installation.

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7. Five Popular Models for Industrial Automation

The following five models cover common automation requirements, including PLC processing, digital input expansion, digital output expansion, and combined I/O.

They are potential choices for new installations, control-panel upgrades, and expansion of compatible SIMATIC S7-1200 systems.

Dimensions and weights are approximate planning figures and should be confirmed against the exact hardware version before purchase.

7.1 Popular Model Comparison Table

The CPU models are controllers rather than expansion modules. They are included because a complete automation system requires a controller to process signals and execute the control program.

The remaining models are expansion modules that provide dedicated input, output, or combined I/O functionality.

7.2 Model 1: 6ES7214-1AG40-0XB0

The CPU 1214C is a compact programmable logic controller intended for general industrial automation.

It executes the control program and coordinates connected I/O modules.

Recommended use

This controller is worth considering when a machine needs a central PLC to process sensor signals, execute operating sequences, and coordinate expansion modules.

Before integration, confirm the controller’s compatibility with the selected I/O module and the required hardware and firmware configuration.

7.3 Model 2: 6ES7215-1AG40-0XB0

The CPU 1215C is another controller within the SIMATIC S7-1200 family.

It can be considered for applications requiring a programmable controller with integrated I/O and appropriate communication capabilities.

Recommended use

This controller is worth evaluating when the project requires integrated I/O, PLC processing, and suitable communication functions.

The final selection should be based on program requirements, communication needs, expansion capacity, and the number of connected devices.

7.4 Model 3: 6ES7221-1BH32-0XB0

The SM 1221 is a dedicated digital input expansion module.

It is designed to acquire digital signals from compatible field devices and make them available to the controller.

Recommended use

This module is useful when the system requires additional 24 V DC digital inputs but does not need a corresponding number of additional outputs.

It is not a direct substitute for the main model because the input voltage and channel configuration differ.

7.5 Model 4: 6ES7222-1BH32-0XB0

The SM 1222 is a digital output expansion module designed for applications requiring additional transistor output channels.

Recommended use

This module can be considered when the project needs additional transistor outputs for compatible DC loads.

Its suitability depends on the load current, output voltage, switching frequency, and output topology. It should not automatically replace a relay-output module.

7.6 Model 5: 6ES7223-1QH32-0XB0

The standard SM 1223 counterpart is a close functional comparison to the 6AG1223-1QH32-2XB0.

It provides eight digital inputs for 120/230 V AC signals and eight relay outputs.

Recommended use

This module is worth considering when the application requires the same general input/output configuration but can operate within the standard product’s environmental specifications.

The standard version should not automatically be treated as an environmentally equivalent replacement for the SIPLUS model.

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8. Comparison of the Main Model and Its Closest Alternatives

The following table summarizes the principal differences among the most relevant configurations.

For applications with AC input signals and demanding environmental requirements, the 6AG1223-1QH32-2XB0 is the most directly relevant configuration among these options.

The -4XB0 version may be suitable where its operating-temperature limits meet the application requirements. The -PH32 version is better suited to compatible 24 V DC input signals.

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9. Product Selection and Installation Recommendations

9.1 Confirm the Input Signal Voltage

The first selection criterion is the input voltage of the connected field devices.

The 6AG1223-1QH32-2XB0 is designed for 120/230 V AC digital inputs.

If the application primarily uses 24 V DC sensors, a compatible DC input module is normally the more appropriate choice.

Using the wrong input voltage can damage the equipment and create an electrical hazard.

9.2 Confirm the Required Number of I/O Channels

The module provides eight digital inputs and eight relay outputs.

Before purchasing, calculate the number of signals required by the application.

Typical inputs may include operating switches, status contacts, and compatible AC sensor or control signals.

Typical outputs may include indicator lamps, relay coils, contactor control circuits, and other compatible loads.

If the machine requires more than eight input or output points, consider a higher-channel-count module or an appropriate combination of expansion modules.

9.3 Select the Appropriate Output Technology

The relay outputs should be used within the specified electrical limits. External contactors, protection devices, and interface relays may be necessary for particular loads.

9.4 Check Environmental Requirements

The environmental specification of the main model is an important part of the selection process.

The conformal coating and extended temperature range do not remove the need for a suitable enclosure, proper wiring, and correct installation practices.

9.5 Verify PLC Compatibility

Before installing the module, confirm that the selected CPU supports the exact expansion module.

The compatibility check should include the CPU model, hardware revision, firmware, expansion capacity, and programming environment.

The total system power budget should also be checked to ensure that the controller and connected modules can operate within their specified limits.

9.6 Confirm Dimensions and Weight

The main model has a width of 45 mm, a height of 100 mm, a depth of 75 mm, and a net weight of approximately 0.227 kg.

These values are suitable for preliminary cabinet planning.

The complete installation must also accommodate the front connector, wiring, adjacent equipment, ventilation, and maintenance access.

The module’s net weight should not be confused with the shipping weight of the packaged product.

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10. Purchasing and Replacement Checklist

Before ordering the 6AG1223-1QH32-2XB0, the following items should be confirmed.

Replacement Guidance

When replacing an existing module, matching the complete original order number is the preferred approach.

If the original module is unavailable, the replacement should be evaluated against the input voltage, number of channels, relay output ratings, operating temperature, environmental protection, dimensions, and PLC compatibility.

A module with the same number of channels is not automatically a direct replacement.

In particular, an AC-input module should not be replaced by a 24 V DC input module without reviewing the field wiring and electrical interface.

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11. Final Product Assessment

The Siemens 6AG1223-1QH32-2XB0 is a SIPLUS SM 1223 digital combination input/output module designed for compatible SIMATIC S7-1200 automation systems.

Its defining characteristics are eight digital inputs for 120/230 V AC signals, eight relay outputs rated for up to 2 A under specified conditions, conformal coating, and an extended operating-temperature range of -40°C to +70°C.

Its compact dimensions of 45 × 100 × 75 mm and approximate net weight of 0.227 kg make it suitable for installations where cabinet space and modular I/O expansion are important considerations.

The main product advantages are its AC input configuration, combined input/output functionality, relay switching flexibility, environmental protection, and integration with a modular PLC system.

For related applications, the 6AG1223-1QH32-4XB0 provides a similar AC-input configuration with different environmental limits, while the 6AG1223-1PH32-2XB0 offers eight 24 V DC inputs and eight relay outputs.

Where more signal channels are required, the 6AG1223-1PL32-2XB0 offers a higher-channel-count relay configuration. For compatible DC loads requiring frequent switching, the 6AG1223-1BL32-2XB0 is another model worth evaluating.

Overall recommendation: The 6AG1223-1QH32-2XB0 is best suited to applications requiring eight 120/230 V AC digital inputs, eight relay outputs, and the environmental characteristics of this SIPLUS variant. Before purchasing or installing the module, confirm the input voltage, output load requirements, temperature limits, controller compatibility, dimensions, and net weight against the exact product specification.