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Product Overview: 6AG1223-1QH32-4XB0 Digital Input/Output Module

1. Product Introduction

The 6AG1223-1QH32-4XB0 is an industrial digital input/output module in the SIPLUS S7-1200 automation product family. It is designed to expand the digital signal-handling capabilities of a compatible programmable logic controller (PLC).

The module combines eight AC digital inputs with eight relay outputs in one compact unit. Its inputs are designed for 120 V AC and 230 V AC digital signals, while its relay outputs can switch compatible electrical loads with a rated switching current of up to 2 A under specified conditions.

A key feature of this model is its conformal coating, which provides additional protection for electronic assemblies against environmental contamination. The module is specified for an operating ambient temperature range of -20°C to +60°C, making it suitable for industrial installations where environmental conditions may be more demanding than those encountered in ordinary indoor control cabinets.

The module is based on the standard 6ES7223-1QH32-0XB0 design and is intended for applications that require a combination of AC signal acquisition and relay-based output control.

By integrating both input and output functions into one module, the product can help simplify control cabinet layouts, reduce the number of separate I/O components, and make field wiring easier to organize.

2. Basic Product Information

Note: The weight above is the approximate net product weight. Installation clearances, wiring space, connector requirements, and enclosure dimensions should be considered separately when designing a control cabinet.

3. Detailed Technical Specifications

3.1 Electrical Specifications

The input and output specifications should be assessed separately when designing a control system. The 120/230 V AC rating applies to the digital inputs, while the relay outputs are switching devices whose permissible voltage, current, load type, and switching frequency must be checked against the applicable electrical specifications.

The 24 V DC supply requirement is another important consideration. It should not be confused with the AC input rating or the voltage of the external loads controlled through the relay contacts.

3.2 Dimensions and Weight

The compact dimensions make this module suitable for installations where control cabinet space is limited. Its actual installation footprint will depend on the PLC configuration, adjacent modules, wiring ducts, terminal access, and the clearances required by the system design.

Although the module itself weighs approximately 0.226 kg, the final assembly may weigh more once mounting hardware, conductors, terminal connections, and other system components are included.

3.3 Environmental Specifications

The conformal coating is intended to improve the protection of electronic assemblies against certain environmental contaminants. It does not mean that the complete module is waterproof, dust-tight, or suitable for unrestricted exposure to moisture, corrosive chemicals, or condensation.

The product’s IP20 rating also means that additional enclosure protection may be necessary, depending on the installation environment.

4. Product Structure and Functional Design

4.1 Digital Input Section

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

These inputs allow the controller to monitor the operating states of compatible field devices. Depending on the application, the signals may represent equipment status, switch positions, operating commands, or other discrete conditions.

The eight input channels provide a convenient way to consolidate several field signals within one module. This can simplify the structure of a control system and reduce the need to install separate input modules for a small number of signals.

Typical input applications include:

• Monitoring the status of compatible AC-operated control devices.
• Detecting the operating state of industrial equipment.
• Receiving discrete signals from switches and auxiliary contacts.
• Monitoring selected machine operating conditions.
• Collecting status information for sequence control.

Before connecting a field device, engineers should verify the signal voltage, wiring arrangement, input grouping, protective measures, and electrical compatibility with the module.

4.2 Relay Output Section

The module includes eight relay outputs, allowing the PLC to control compatible external circuits.

Relay outputs are useful when a control system needs to switch loads or control circuits that are not directly compatible with ordinary low-voltage electronic outputs.

Typical applications include controlling interface relays, contactor coils, indicator circuits, and other suitable electrical loads.

The eight outputs provide flexibility when designing machine sequences or coordinating several devices from a single controller.

The stated 2 A switching rating must be interpreted in accordance with the applicable specifications. The permissible switching current can depend on the switching voltage, load type, electrical characteristics, switching frequency, and expected service life.

For inductive loads such as contactor coils, suitable suppression and protective components may be required. Engineers should also verify that the selected load is appropriate for relay switching and that the contact rating is not exceeded.

4.3 Conformal Coating

A notable characteristic of this model is its conformal coating.

In industrial environments, electronic assemblies may be exposed to dust, airborne contaminants, or other conditions that can affect long-term reliability. A conformal coating forms a protective layer over selected electronic components and circuit-board areas.

This additional protection can be beneficial in control cabinets located near production equipment or in facilities where environmental conditions are less controlled.

However, conformal coating should be regarded as an additional protective measure rather than a replacement for correct enclosure design, appropriate wiring, maintenance, and environmental control.

4.4 Integration with a PLC System

The module belongs to the S7-1200 product family and is intended for compatible system configurations.

It expands the number and types of field signals available to the controller. The PLC program can then use the input states to determine when outputs should be activated or deactivated.

For example, a machine may use AC input signals to monitor operating conditions and relay outputs to control selected auxiliary circuits. The PLC program coordinates these signals according to the machine’s operating sequence.

Before installation, users should confirm the exact hardware compatibility, firmware requirements where applicable, module configuration, addressing, and wiring instructions for the intended controller.

5. Main Product Applications

5.1 Industrial Machinery

The module can be used in machinery requiring a combination of AC digital signal acquisition and relay output control.

In a typical machine-control application, the digital inputs monitor the states of compatible field devices, while the relay outputs control selected auxiliary circuits.

Possible applications include:

• Packaging machinery.
• Assembly equipment.
• Material-handling systems.
• Production-line auxiliary equipment.
• Machine status monitoring.
• Automated equipment with multiple discrete control signals.

The specific suitability of the module depends on the electrical characteristics of the field devices and the overall control-system design.

5.2 Production-Line Automation

Production lines often contain numerous discrete signals representing equipment status, operating conditions, and process sequence requirements.

The eight inputs and eight relay outputs allow a compact control system to manage a defined group of such signals.

The module can help organize field wiring and provide a clear separation between signal acquisition and output switching.

In a production line, it may be used for selected equipment interlocks, auxiliary actuator control, machine-state monitoring, or coordination of individual operating steps.

The final application should be designed with suitable safety measures, electrical protection, and fault-handling logic.

5.3 Building and Facility Equipment

The module may also be suitable for selected building and facility automation applications where compatible AC signals must be monitored and relay-controlled circuits must be switched.

Potential applications include:

• Equipment status monitoring.
• Auxiliary ventilation control.
• Selected electrical equipment control.
• Utility-system monitoring.
• Control of compatible auxiliary devices.
• Integration of discrete equipment signals into a PLC-based monitoring system.

The module should not be assumed to be suitable for every building-control application. Voltage compatibility, output ratings, applicable regulations, and the required level of electrical isolation must be checked before use.

5.4 Environmental Monitoring in Industrial Cabinets

The conformal coating makes this version relevant to certain industrial control cabinets where additional protection of electronic assemblies is desirable.

Examples include cabinets installed near production areas or in facilities with environmental contaminants that may affect ordinary electronic components.

The specified operating range of -20°C to +60°C provides an additional selection criterion for applications with changing ambient temperatures.

The module should still be installed within an enclosure appropriate to the actual environmental conditions. Direct exposure to rain, water jets, heavy condensation, or corrosive substances should not be assumed permissible.

5.5 Equipment Retrofit and Control-System Expansion

In an existing compatible S7-1200 installation, an expansion module can provide additional I/O capacity without requiring the entire control system to be redesigned.

The product may be considered when:

• More AC digital inputs are needed.
• Additional relay outputs are required.
• Existing field wiring needs to be reorganized.
• A machine requires more discrete control points.
• An installation needs a module with conformal-coated electronic assemblies.

Before replacing or adding a module, users should verify the exact article number, electrical ratings, dimensions, hardware compatibility, and program configuration.

6. Product Advantages

6.1 Combined Input and Output Functions

The module combines eight digital inputs and eight relay outputs in a single device.

This arrangement can reduce the number of separate modules required for applications with a modest number of AC input signals and relay-controlled circuits.

It also helps simplify I/O planning, wiring organization, and the overall layout of the control cabinet.

6.2 Support for 120/230 V AC Digital Inputs

The AC input design makes the module useful in applications where field signals are supplied at 120 V AC or 230 V AC.

This can be advantageous when integrating compatible AC-operated control devices into a PLC-based system.

The exact wiring and electrical requirements must be checked before connecting field devices.

6.3 Relay-Based Output Switching

The relay outputs provide flexibility for controlling compatible external circuits.

They can be useful when switching selected loads that require relay contacts rather than conventional transistor outputs.

Relay outputs also allow the designer to consider a range of load types, provided the electrical ratings and switching limitations are respected.

6.4 Conformal-Coated Electronics

The conformal coating provides additional protection for electronic assemblies against certain environmental contaminants.

This can be an advantage in industrial installations where the operating environment is more demanding than that of a clean office or laboratory.

The coating does not remove the need for a suitable enclosure or proper environmental management.

6.5 Compact Installation Dimensions

With a width of 45 mm, a height of 100 mm, and a depth of 75 mm, the module has a relatively compact physical footprint.

This can help reduce space requirements in control cabinets and simplify the arrangement of compatible expansion modules.

Designers should still allow sufficient space for wiring, terminal access, and maintenance.

6.6 Industrial Temperature Range

The specified operating ambient temperature range is -20°C to +60°C.

This range can support applications in industrial environments where temperatures may vary considerably.

The permissible temperature range of the complete installation will also depend on cabinet temperature, neighboring components, heat dissipation, mounting arrangement, and other system conditions.

6.7 Integration into an Established Automation Platform

The module belongs to the S7-1200 family, making it relevant to compatible PLC installations built around that platform.

Using modules from a compatible system family can simplify hardware planning and help maintain a consistent architecture.

Compatibility should nevertheless be confirmed for the specific controller, firmware, configuration, and application.

6.8 Convenient I/O Organization

The combination of eight inputs and eight outputs gives engineers a clearly defined set of signal channels.

This can simplify the allocation of field devices, documentation of I/O addresses, and troubleshooting during commissioning.

A structured I/O layout can also make later maintenance and modifications easier.

6.9 Potential Reduction in Cabinet Complexity

By integrating two types of I/O in one unit, the module may reduce the number of separate components needed for a small or medium-sized signal group.

Depending on the overall system design, this may help reduce wiring complexity, improve layout clarity, and make maintenance more straightforward.

The actual cost and space benefits will depend on the number of signals, cabinet configuration, and alternative hardware options.

6.10 Suitability for Defined Industrial Control Tasks

The module is particularly relevant when an application requires a combination of AC input monitoring, relay output switching, and additional protection for electronic assemblies.

It is not intended to replace safety-rated equipment, protective devices, or specialized modules when those functions are required.

7. Brand and Product Series

The SM 1223 designation identifies the module as a combined digital input/output unit. Within the S7-1200 architecture, the module serves as an expansion component for compatible controllers.

The SIPLUS version is intended for applications requiring additional environmental protection features. The exact environmental ratings should always be checked against the selected article number rather than inferred from the product-family name alone.

8. Recommended Related Models

The following models are related to the same general automation platform or provide comparable digital I/O functions. Their electrical specifications are not identical, so they should be treated as alternatives for evaluation rather than direct replacements without further checking.

8.1 Related Model Comparison Table

Important selection note: The first two models and the standard SM 1223 reference model have recognizable relationships to the target module. The remaining article numbers should be checked against their exact technical records before purchase or substitution. Dimensions and weights marked approximate should be confirmed against the applicable hardware revision.

8.2 Model 1: 6AG1223-1QH32-2XB0

This is a closely related SIPLUS SM 1223 model with eight AC digital inputs and eight relay outputs.

Its stated environmental specification differs from the target model. It is specified for an operating temperature range of -40°C to +70°C, with startup permitted from -25°C under the stated conditions.

It may be worth evaluating for applications where the operating temperature range is a major selection criterion.

However, the environmental difference alone does not establish that it is a direct replacement. The wiring, system compatibility, electrical ratings, and other installation requirements must still be checked.

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

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

Its DC input configuration distinguishes it from the target module, which uses 120/230 V AC digital inputs.

It may be more appropriate for systems where field devices provide 24 V DC status signals.

Because the input types differ, this model should not be substituted into an existing AC-input installation without reviewing the field wiring and control-system requirements.

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

This article number is included as a model to investigate within the broader SIPLUS SM 1223-related product range.

Before considering it for a project, confirm its exact input voltage, output technology, environmental rating, dimensions, and weight. The model number alone is not sufficient to establish electrical equivalence.

A formal technical comparison is particularly important if the module will be used to replace an existing component in an operating production line.

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

This is another model to evaluate within the broader SIPLUS automation product range.

Its exact configuration should be established from the full article number and technical documentation before it is added to a bill of materials.

In industrial applications, small differences in input voltage, output switching technology, or environmental specification can affect compatibility. For this reason, it should be treated as a candidate for technical review rather than an assumed direct substitute.

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

This is the standard SM 1223 design on which the target SIPLUS model is based.

It provides eight AC digital inputs and eight relay outputs and may be worth considering when the application does not require the additional environmental protection features associated with the SIPLUS version.

The standard and SIPLUS versions should not automatically be regarded as interchangeable in every environment. The operating temperature, coating, installation conditions, and other relevant specifications should be compared before making a decision.

9. Recommended Popular Models from the Same Brand Family

The following table lists five widely used model types from the same broader industrial automation ecosystem. They serve different functions, so they are not all direct replacements for the target module.

The specifications are intended as a preliminary comparison. Exact article-number variants, firmware requirements, electrical ratings, dimensions, and weights should be confirmed before ordering.

9.1 Popular Model Comparison Table

Note: The dimensions and weights shown for the CPU and I/O models are approximate selection values, not guaranteed order-specific specifications. Confirm the complete article number and corresponding technical data before using these figures for cabinet design, shipping calculations, or formal procurement.

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

This model belongs to the S7-1200 CPU product category.

A PLC CPU processes the control program, evaluates input states, manages internal data, and coordinates output actions. It serves as the central control component in an automation system.

A CPU model may be suitable when designing a new control system or expanding an existing installation that requires a compatible processing unit.

It is not a direct replacement for the target SM 1223 module because the two products perform different functions. The CPU is responsible for program execution, while the SM 1223 is an expansion module for digital inputs and outputs.

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

This is another S7-1200 CPU model to consider when comparing PLC processing and control options.

The appropriate CPU depends on the required program size, memory, communication interfaces, integrated I/O, processing requirements, and the number of expansion modules needed.

When selecting a CPU for use with the target SM 1223 module, the designer should confirm system compatibility and the maximum supported hardware configuration.

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

This model belongs to the SM 1221 digital input module category.

A digital input module collects discrete signals from compatible field devices and transfers their states to the PLC.

It may be appropriate when an application requires more input channels but does not need additional outputs from the same module.

The exact input voltage and wiring requirements must be checked for the selected version. A DC input module should not be assumed to accept the 120/230 V AC signals supported by the target module.

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

This model belongs to the SM 1222 digital output module category.

Its principal purpose is to provide additional output channels for compatible control applications.

It may be useful when a system needs to control more indicators, actuators, or other output devices.

The output technology is an important consideration. Transistor outputs and relay outputs have different switching characteristics and cannot automatically be substituted for one another.

Before selecting this module, verify the output voltage, current rating, switching frequency, load characteristics, and required protective components.

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

This standard SM 1223 module is the closest functional comparison in the recommended list.

It combines eight 120/230 V AC digital inputs with eight relay outputs, providing a similar I/O arrangement to the target SIPLUS model.

The principal consideration is environmental suitability. Where conformal coating and the specified environmental characteristics of the SIPLUS version are required, the standard module should not be treated as equivalent without a complete application review.

Where environmental requirements are less demanding, it may be a candidate for evaluation as part of a compatible S7-1200 configuration.

10. Comparison Between the Target Model and the Standard Version

The two models share the same general I/O arrangement, but similar dimensions and electrical functions do not guarantee that they are interchangeable in every application.

A replacement decision should include a review of environmental conditions, installation requirements, controller compatibility, wiring, and the exact product documentation.

11. Installation and Commissioning Considerations

11.1 Verify the Supply Voltage

The module has a rated supply voltage of 24 V DC, with a permissible range of 20.4–28.8 V DC.

The power supply should be selected to provide stable voltage under the expected operating conditions. The system designer should also account for the consumption of the controller, expansion modules, and any connected devices supplied from the same source.

11.2 Separate Input and Output Requirements

The AC digital inputs and relay outputs have different electrical functions.

Before connecting the module, check the required input voltage, the output load voltage, the current demand, the terminal assignments, and any applicable protective measures.

Do not assume that a relay output can switch every load rated at less than 2 A. The permissible load depends on the complete switching conditions.

11.3 Confirm Cabinet Temperature

The stated operating temperature range is -20°C to +60°C.

Actual conditions inside an electrical cabinet may be warmer than the surrounding room because of heat generated by the PLC, power supply, drives, and other components.

Cabinet ventilation, spacing, installation orientation, and the total heat load should be considered during system design.

11.4 Plan Wiring and Maintenance Access

Although the module is compact, sufficient space should be provided for terminal access, wire routing, cable identification, and future maintenance.

A well-organized cabinet layout helps reduce wiring errors and simplifies fault diagnosis.

The installer should also follow the applicable electrical isolation procedures and ensure that hazardous voltages are safely disconnected before work begins.

11.5 Configure the PLC Program

After installation, the module must be configured as part of the compatible PLC system.

The control program should correctly interpret the input signals and define the required output behavior.

During commissioning, test each input and output individually. Verify that the physical wiring corresponds to the intended I/O addresses and that the system responds correctly under normal operating conditions.

11.6 Consider Load Protection

Relay-controlled inductive loads may produce switching transients.

Depending on the load and circuit design, suitable suppression components may be required to reduce electrical interference and protect connected equipment.

The selection of protective components should follow the load manufacturer’s recommendations and the applicable electrical design requirements.

12. Purchasing and Model Selection Recommendations

When selecting a module for a new installation or as a replacement part, the full article number should be checked carefully.

A model with a similar name may have a different input voltage, output technology, temperature range, or environmental protection specification.

The following checks are recommended before ordering:

1. Confirm the complete model number. Check every character in the article number, including the suffix.
2. Verify the input voltage. The target model uses 120/230 V AC digital inputs.
3. Verify the output technology. Confirm that relay outputs are required and that their ratings match the intended loads.
4. Check the environmental range. Confirm that -20°C to +60°C is appropriate for the actual operating environment.
5. Review the coating requirement. Determine whether the conformal-coated version is necessary for the installation.
6. Confirm dimensions and weight. Use the exact technical data when planning the cabinet, calculating shipping weight, or preparing a formal bill of materials.
7. Check PLC compatibility. Confirm compatibility with the existing controller, system configuration, and any applicable firmware requirements.
8. Review the wiring requirements. Ensure that the terminal arrangement and field-device wiring are suitable for the selected module.
9. Evaluate replacement suitability. Do not assume that a model with a similar appearance or the same number of channels is a direct substitute.
10. Check the exact revision and product status. For long-term projects, verify availability and lifecycle information before finalizing the design.

13. Summary

The 6AG1223-1QH32-4XB0 is a SIPLUS S7-1200 SM 1223 digital input/output module that combines eight 120/230 V AC digital inputs with eight relay outputs.

Its principal characteristics include a 24 V DC supply requirement, relay switching capability of up to 2 A under specified conditions, conformal-coated electronic assemblies, and an operating ambient temperature range of -20°C to +60°C.

With dimensions of 45 × 100 × 75 mm and a net weight of approximately 0.226 kg, it provides a compact I/O expansion option for compatible industrial control systems.

The module is particularly relevant to applications requiring both AC digital signal acquisition and relay-based output switching. Potential uses include industrial machinery, production-line equipment, selected facility-control systems, and PLC installations requiring additional digital I/O capacity.

The recommended related models and popular product-family models offer different combinations of processing, input, output, and environmental features. They should be evaluated according to the actual application rather than selected solely on the basis of model-number similarity.

For a direct comparison, the most important factors are input voltage, output type, switching ratings, environmental specification, PLC compatibility, dimensions, and weight. Confirming these details before purchase helps reduce the risk of selecting an unsuitable module or creating compatibility problems during installation.