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- STBACO1225
- Basic Analog Output Module
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- 70 × 13.9 × 128.3 mm
- 0.16 kg
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Product Overview
The Schneider STBACO1225 is a Modicon STB Basic Analog Output Module for applications that require analog current signals from a distributed I/O island to field equipment. It provides four analog output channels and is suited to control loops where the PLC or PAC needs to send continuously variable commands rather than simple ON/OFF signals.
In a typical Modicon STB installation, the module receives output data from the controller through the STB island bus and converts the digital command into an analog current signal for the connected field device. This arrangement is useful for proportional valves, actuators, drive references, and other equipment that accepts standard current inputs.
The STBACO1225 fits into the modular STB architecture alongside digital I/O, analog input, power distribution, and network interface modules. It can therefore be used as part of a larger distributed control station where several field signals are handled close to the machine or process equipment.
For replacement applications, the existing STB island configuration should be checked before installation. Particular attention should be given to the module type, output channel configuration, terminal arrangement, field-device signal requirements, and controller I/O mapping.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Schneider Electric |
| Model | STBACO1225 |
| Product Family | Modicon STB |
| Product Type | Basic Analog Output Module |
| Analog Output Type | Current |
| Number of Outputs | 4 |
| Output Signal | 0–20 mA / 4–20 mA |
| Rated Supply Voltage | 24 V DC |
| Module Type | Basic Analog Output |
| Protection Degree | IP20 |
| Dimensions | 70 × 13.9 × 128.3 mm |
| Weight | 0.16 kg |
Product Features
- Modicon STB Basic Analog Output Module
- Model STBACO1225
- Four analog current output channels
- Supports standard current-based control signals
- Suitable for proportional control applications
- Integrates with the Modicon STB distributed I/O platform
- Works with PLC and PAC-based automation architectures
- Suitable for control valves and analog actuators
- Can be used for compatible drive reference signals
- Supports distributed field-device control
- Designed for integration with modular STB island configurations
- Suitable for machine and process automation
Working Principle
The STBACO1225 receives analog command values from the controller through the Modicon STB communication architecture.
PLC / PAC → Network Interface → STB Island Bus → STBACO1225 → Field Device
The control program determines the required output value according to the application logic or closed-loop control algorithm. The value is transferred to the STB island, and the STBACO1225 converts the corresponding digital command into an analog current output.
For a proportional valve, for example, the controller can calculate a required opening position and send the corresponding current command through one of the module’s output channels. The receiving device then interprets the current signal according to its own configured scaling.
The same principle can be applied to compatible drive equipment, actuators, and process-control devices. The STBACO1225 handles the analog interface, while the PLC or PAC remains responsible for the process calculation, sequencing, interlocks, and control strategy.
During commissioning, comparing the commanded output value with the actual measured current is a practical way to isolate problems. A mismatch can indicate an issue with controller configuration, STB communication, module configuration, wiring, or the receiving device.
Role in a Modicon STB Distributed I/O Control Architecture
The STBACO1225 functions as the analog output interface between the STB island and field equipment requiring continuous current commands.
PLC / PAC → Industrial Network → NIM → STB Island Bus → STBACO1225 → Field Equipment
| System Element | Function |
|---|---|
| STBACO1225 | Generates four 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 | Supports power distribution within the STB island |
| Network Interface Module | Exchanges I/O data between the controller and STB island |
| 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 mechanical or process action |
The exact architecture depends on the selected network interface, power distribution arrangement, I/O modules, controller, and field equipment.
Industrial Applications
| Application | Typical Use |
|---|---|
| Process Control | Sending continuous commands to valves and actuators |
| Water Treatment | Controlling proportional process valves |
| Pump Systems | Providing analog references to compatible drives |
| HVAC Systems | Controlling proportional valves and dampers |
| Process Skids | Managing distributed analog control points |
| Packaging Machinery | Controlling variable-position actuators |
| Manufacturing Lines | Sending analog commands to machine equipment |
| Chemical Processing | Regulating compatible process-control devices |
| Utility Systems | Handling distributed analog control outputs |
| Material Handling | Providing analog references to compatible equipment |
Installation and Maintenance
- Confirm that the replacement module is the correct STBACO1225 model before removing the existing unit.
- Verify that each connected field device accepts the required analog current signal.
- Check the number of analog output channels required by the application and compare it with the existing I/O configuration.
- Confirm the installed STB mounting base and terminal connector arrangement.
- Verify the 24 V DC power distribution and STB island configuration before energizing the system.
- Check field wiring for loose terminals, damaged conductors, reversed connections, or incorrect channel assignments.
- Confirm the controller I/O mapping corresponds to the physical STBACO1225 output channels.
- Check the scaling configured in the PLC or PAC against the scaling expected by each connected field device.
- During commissioning, verify the commanded value and measure the actual current at the corresponding output circuit.
- If one channel behaves abnormally while the others operate normally, check the individual wiring and receiving device before replacing the complete module.
- If multiple channels show abnormal behavior, inspect the STB island communication, power distribution, configuration, and controller-side diagnostics.
- Keep a record of channel assignments and connected field devices so that future troubleshooting can be performed without relying on undocumented wiring changes.
Related Components
| Component | Function |
|---|---|
| STBXBA2000 | Mounting base for STB I/O modules |
| 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 the required STB power |
| PLC / PAC | Generates analog control commands |
| Proportional Valve | Receives a continuous current command |
| Variable Speed Drive | Uses an analog reference where supported |
| Field Actuator | Responds to the analog output signal |
Recommended Related Models
| Model / Product Family | Product Type | Typical Application |
|---|---|---|
| Schneider STBACO0220 | Standard Analog Output Module | Two-channel analog current output |
| Schneider STBACO1210 | Basic Analog Output Module | Analog voltage output applications |
| Schneider STBACI1400 | Standard Analog Input Module | Multi-channel analog current signal acquisition |
| Schneider STBAVI1255 | Standard Analog Input Module | Analog voltage signal acquisition |
| Schneider STBXBA2000 | Mounting Base | Mounting STB I/O modules |
| Schneider STBPDT3100 | Power Distribution Module | STB island power distribution |
| Schneider STBPDT3105 | Power Distribution Module | Alternative STB power distribution |
| Schneider Modicon STB | Distributed I/O Platform | Modular machine and process I/O |
Key Advantages
- Four analog output channels in one STB module.
- Supports current-based analog control applications.
- Suitable for proportional valves and actuators.
- Can provide analog references to compatible drives.
- Integrates with the Modicon STB distributed I/O architecture.
- Suitable for PLC and PAC control systems.
- Useful for machine and process automation.
- Supports centralized controller logic with distributed field output.
Technical FAQs
What is the main difference between the STBACO1225 and a digital output module?
The STBACO1225 generates continuously variable analog current signals, while a digital output module normally switches between discrete states. The STBACO1225 is therefore suitable when the receiving device needs a proportional command such as a valve position or analog reference.
How many field devices can the STBACO1225 control?
The module has four analog output channels, so up to four independent analog current signals can be assigned when the application configuration and connected equipment support the required signal type.
What should be checked if an STBACO1225 output does not match the PLC command?
Check the PLC output value and scaling first, then verify the STB island communication and module configuration. After that, measure the actual current at the field connection and inspect the associated wiring and receiving device. This helps determine whether the problem is on the controller side, I/O side, or field-device side.
Can the STBACO1225 be used for closed-loop process control?
Yes. The module can serve as the analog output stage of a closed-loop control system. For example, the PLC can compare a process measurement from an analog input module with a setpoint, calculate the required control output, and send the resulting current command through the STBACO1225 to a compatible valve or actuator.