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- STBACO0220
- Analog Output Module
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- 70 × 18.4 × 128.3 mm
- 0.059 kg
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Product Overview
The Schneider STBACO0220 is a Modicon STB Standard Analog Output Module used to send continuous current commands from a distributed I/O system to field equipment. It has two analog output channels for applications using standard 0–20 mA or 4–20 mA signals.
In a process control cabinet, the module can send a current reference to a proportional valve, actuator, or compatible drive. For example, a PLC can calculate the required valve position from a pressure or flow loop, then send the corresponding command through the STBACO0220. The module converts the controller output data into the analog signal expected by the field device.
The STBACO0220 is part of the modular Modicon STB distributed I/O platform. It operates as one I/O position within an STB island, with the island network interface exchanging data between the distributed I/O and the PLC or PAC.
This architecture is useful when control devices are spread around a machine or process area. An STB island can be installed close to the field equipment, allowing analog output wiring to terminate locally rather than routing every signal to the main controller cabinet.
For replacement work, the installed STB island configuration should be checked together with the network interface, mounting base, terminal arrangement, power distribution, field-device signal requirements, and controller configuration.
Technical Specifications
| ParameterSpecification | |
|---|---|
| Manufacturer | Schneider Electric |
| Model | STBACO0220 |
| Product Family | Modicon STB |
| Product Type | Standard Analog Output Module |
| Analog Output Type | Current |
| Number of Outputs | 2 |
| Output Signal | 0–20 mA / 4–20 mA |
| Resolution | 15 bits + sign |
| Rated Supply Voltage | 24 V DC |
| Logic Bus Current Consumption | 90 mA at 5 V DC |
| Update Time | 2 ms |
| Protection Degree | IP20 |
| Module Type | Standard Analog Output |
| Compatible Power Distribution Modules | STBPDT3100 / STBPDT3105 |
| Dimensions | 70 × 18.4 × 128.3 mm |
| Weight | 0.059 kg |
Product Features
- Modicon STB Standard Analog Output Module
- Model STBACO0220
- Two analog current output channels
- Supports 0–20 mA and 4–20 mA signals
- 15-bit + sign resolution
- 24 V DC supply
- 2 ms output update time
- Suitable for proportional analog control
- Suitable for valves, actuators, and compatible drive references
- Supports distributed analog signal transmission
- Integrates with PLC and PAC-based automation systems
- Installs within the modular Modicon STB island architecture
- Compatible with STB power distribution arrangements
- Suitable for machine and process control applications
Working Principle
The STBACO0220 acts as the analog output interface between the controller and a field device.
PLC / PAC → Network Interface → STB Island Bus → STBACO0220 → Field Device
The PLC application determines the required output according to the control strategy. That value is transferred to the STB island, where the STBACO0220 converts the controller data into a corresponding current signal.
For a valve positioner using 4–20 mA, the output current represents the requested operating position within the configured range. A similar arrangement can be used when a compatible drive requires an analog reference.
The module handles the physical analog conversion, while the PLC remains responsible for the control calculation, sequencing, interlocks, alarms, and process logic.
This separation is useful during commissioning and troubleshooting. The controller command can be compared with the actual output current to determine whether an issue is related to the application program, STB communication, module configuration, wiring, or the receiving field device.
Role in a Modicon STB Distributed I/O Control Architecture
The STBACO0220 occupies the analog output position between the STB island and external equipment requiring a continuous current command.
PLC / PAC → Industrial Network → NIM → STB Island Bus → STBACO0220 → Field Device
| System ElementFunction | |
|---|---|
| STBACO0220 | Generates two analog current output signals |
| STBXBA2000 | Provides the mounting base for the STB module |
| STBXTS1100 | Provides screw-type field connection |
| STBXTS2100 | Provides spring-clamp field connection |
| STBPDT3100 / STBPDT3105 | Handles power distribution within the STB island |
| Network Interface Module | Exchanges I/O data between the STB island and controller |
| PLC / PAC | Generates application-specific analog commands |
| Control Valve | Receives a proportional current signal |
| Variable Speed Drive | Can receive an analog reference where supported |
| Field Actuator | Converts the analog command into physical movement |
The final arrangement depends on the selected STB modules, network interface, power distribution scheme, field equipment, and controller configuration.
Industrial Applications
| ApplicationTypical Use | |
|---|---|
| Water Treatment | Sending proportional commands to process valves and actuators |
| Pump Systems | Providing analog references to compatible drive equipment |
| HVAC Systems | Controlling proportional valves and dampers |
| Process Skids | Regulating field devices through continuous current signals |
| Packaging Machinery | Sending variable commands to machine actuators |
| Manufacturing Lines | Connecting PLC output values with analog field equipment |
| Chemical Processing | Adjusting process valves and proportional actuators |
| Food and Beverage Equipment | Controlling compatible process devices |
| Utility Systems | Managing distributed analog control points |
| Material Handling | Providing analog references to compatible motor-control equipment |
Installation and Maintenance
- Confirm the complete STBACO0220 reference before installation or replacement.
- Verify that the receiving device accepts a compatible 0–20 mA or 4–20 mA input.
- Check the required number of analog output channels for the application.
- Confirm the existing Modicon STB island and network interface configuration.
- Verify the installed mounting base and terminal connector arrangement.
- Check the 24 V DC power distribution before energizing the island.
- Inspect analog output wiring for loose connections, damaged conductors, and incorrect terminal assignments.
- Confirm the output channel mapping in the PLC or PAC program.
- Check that the configured current range matches the receiving device.
- During commissioning, measure the actual output current and compare it with the controller command.
- If an output remains abnormal, check the PLC configuration, STB communication, module configuration, power supply, wiring, and receiving device before replacing the module.
- Record the field device connected to each output channel to simplify future troubleshooting and maintenance.
When troubleshooting a current output, measuring the actual signal at the field connection is often more useful than relying only on the value displayed by the PLC. It helps establish whether the fault occurs before or after the analog output stage.
Related Components
| ComponentFunction | |
|---|---|
| STBXBA2000 | Mounting base for the STB I/O module |
| STBXTS1100 | Screw-type terminal connector |
| STBXTS2100 | Spring-clamp terminal connector |
| STBPDT3100 | STB power distribution module |
| STBPDT3105 | STB power distribution module |
| Standard NIM | Network interface for the STB island |
| 24 V DC Power Supply | Supplies STB control and I/O power |
| PLC / PAC | Generates analog output commands |
| Proportional Control Valve | Receives a continuous current command |
| Variable Speed Drive | Uses an analog reference where supported |
| Field Actuator | Responds to the analog current signal |
Recommended Related Models
| Model / Product FamilyProduct TypeTypical Application | ||
|---|---|---|
| Schneider STBACI1400 | Standard Analog Input Module | Eight-channel analog current signal acquisition |
| Schneider STBACO1210 | Standard Analog Output Module | Analog output applications using voltage signals |
| Schneider STBAVI1255 | Standard Analog Input Module | Analog voltage signal acquisition |
| Schneider STBXBA2000 | Mounting Base | Installation of STB I/O modules |
| Schneider STBPDT3100 | Power Distribution Module | STB island power distribution |
| Schneider STBPDT3105 | Power Distribution Module | Alternative STB power distribution arrangement |
| Schneider Modicon STB | Distributed I/O Platform | Modular machine and process I/O |
Key Advantages
- Two analog current output channels.
- Supports 0–20 mA and 4–20 mA signals.
- 15-bit + sign resolution.
- 2 ms output update time.
- Suitable for proportional valves and analog actuators.
- Can provide analog references to compatible drive equipment.
- Integrates into Modicon STB distributed I/O islands.
- Suitable for PLC and PAC-based control systems.
- Useful for both machine and process automation.
Technical FAQs
What type of field devices can be connected to the STBACO0220?
The STBACO0220 can be connected to field devices that accept compatible 0–20 mA or 4–20 mA control signals. Typical examples include proportional valve positioners, actuators, and compatible variable speed drives.
Is the STBACO0220 an analog input or analog output module?
The STBACO0220 is a Standard Analog Output Module. It sends current signals from the controller-side STB system toward field equipment rather than acquiring measurement signals from transmitters.
How should a 4–20 mA output be checked during commissioning?
The PLC command should first be verified against the intended process value. The actual current at the output circuit can then be measured and compared with the expected signal. If the measured value is correct but the field device does not respond, attention should move to the field wiring, device configuration, or receiving equipment.
Can the STBACO0220 be used with a variable speed drive?
It can be used to provide an analog reference to a compatible variable speed drive when the drive accepts the corresponding current signal. The drive itself remains responsible for converting the reference into motor control, so its input configuration and scaling must match the STBACO0220 output configuration.