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- STBAVI1255
- Basic Analog Input Module
- France
- 70 × 18.4 × 128.3 mm
- 0.116 kg
- Xiamen, China
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Product Overview
The Schneider STBAVI1255 is a Modicon STB Basic Analog Input Module used to bring continuous voltage signals from field instruments into a distributed I/O system. It provides four analog input channels for applications where process variables or equipment feedback are transmitted as standard voltage signals.
In a typical STB island, the module receives analog signals from connected field devices and converts them into data that can be processed by the PLC or PAC. The controller can then use these values for monitoring, alarming, sequencing, or closed-loop control.
Typical sources include analog transmitters, sensors, signal conditioners, and other instrumentation with compatible voltage outputs. The module is particularly useful when analog measurements need to be collected locally at a machine or process station instead of being wired directly back to the main controller cabinet.
The STBAVI1255 operates as part of the modular Modicon STB distributed I/O platform. It can be combined with digital I/O, analog output, power distribution, and network interface modules according to the requirements of the control system.
For replacement or expansion work, the existing STB island configuration should be checked carefully, including the field signal range, channel assignment, terminal arrangement, controller configuration, and power distribution.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Schneider Electric |
| Model | STBAVI1255 |
| Product Family | Modicon STB |
| Product Type | Basic Analog Input Module |
| Analog Input Type | Voltage |
| Number of Inputs | 4 |
| Input Signal | Voltage |
| Module Type | Basic Analog Input |
| Rated Supply Voltage | 24 V DC |
| Protection Degree | IP20 |
| Dimensions | 70 × 18.4 × 128.3 mm |
| Weight | 0.116 kg |
Product Features
- Modicon STB Basic Analog Input Module
- Model STBAVI1255
- Four analog voltage input channels
- Suitable for continuous field measurements
- Integrates into the Modicon STB distributed I/O platform
- Suitable for PLC and PAC-based control architectures
- Supports analog process monitoring
- Can be used as the measurement side of closed-loop control
- Suitable for sensor and instrumentation signals with compatible voltage outputs
- Supports distributed signal acquisition
- Can be combined with digital and analog STB modules
- Suitable for machine and process automation
Working Principle
The STBAVI1255 functions as the analog measurement interface between field instrumentation and the controller.
Field Sensor / Transmitter → STBAVI1255 → STB Island Bus → Network Interface → PLC / PAC
A connected field device generates a voltage signal corresponding to the measured process condition. The STBAVI1255 receives this signal through the assigned input channel and converts it into digital data for the STB island.
The PLC or PAC reads the resulting input value and applies the appropriate scaling in the control program. The value can then be used for process visualization, alarm thresholds, interlocks, calculations, or closed-loop control.
For example, a voltage-output pressure transmitter can be connected to one input channel. The controller can convert the acquired signal into an engineering value and compare it with a configured pressure setpoint. If the control strategy requires an analog response, a separate STB analog output module can send the calculated command to a compatible actuator.
When troubleshooting, it is useful to compare the actual voltage measured at the field terminals with the value reported by the controller. This separates sensor and wiring problems from I/O configuration or communication problems.
Role in a Modicon STB Distributed I/O Control Architecture
The STBAVI1255 serves as the analog signal acquisition point within a Modicon STB distributed I/O island.
Field Instrument → STBAVI1255 → STB Island Bus → NIM → Industrial Network → PLC / PAC
| System Element | Function |
|---|---|
| STBAVI1255 | Acquires four analog voltage 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 STB island and controller |
| PLC / PAC | Processes acquired analog values |
| Voltage Transmitter | Generates a voltage signal representing a process variable |
| Sensor / Signal Conditioner | Provides a compatible analog voltage output |
| STB Analog Output Module | Can provide a control output for closed-loop applications |
The actual arrangement depends on the selected STB network interface, power distribution scheme, analog modules, field instruments, and controller configuration.
Industrial Applications
| Application | Typical Use |
|---|---|
| Process Control | Acquiring continuous measurements from field instrumentation |
| Water Treatment | Monitoring process variables from compatible transmitters |
| HVAC Systems | Monitoring temperature, pressure, or other conditioned signals |
| Pump Systems | Acquiring equipment feedback for monitoring and control |
| Manufacturing Lines | Collecting analog measurements from machine sensors |
| Packaging Machinery | Monitoring continuously variable machine parameters |
| Chemical Processing | Acquiring process measurements for control loops |
| Utility Systems | Collecting distributed analog instrumentation |
| Process Skids | Bringing local instrumentation into the PLC system |
| Equipment Monitoring | Reading compatible voltage-based sensor outputs |
Installation and Maintenance
- Confirm that the replacement module is the correct STBAVI1255 model before installation.
- Verify that each connected sensor or transmitter provides a compatible voltage output.
- Check the signal range of every field device against the configured input range.
- Confirm the STB mounting base and terminal connector arrangement before wiring.
- Verify the 24 V DC supply and STB island power distribution before energizing the system.
- Check field wiring for loose terminals, damaged conductors, incorrect polarity, or incorrect channel assignments.
- Confirm that each physical input channel matches the corresponding PLC or PAC I/O address.
- Check the scaling parameters in the controller program so that the electrical input is correctly converted into an engineering value.
- During commissioning, measure the field voltage with suitable test equipment and compare it with the value reported by the control system.
- If one channel produces an unexpected reading, inspect the associated sensor, wiring, terminal connection, and channel configuration before replacing the module.
- If several channels show abnormal values at the same time, check the STB island power supply, network communication, module configuration, and controller diagnostics.
- Keep the channel-to-instrument mapping documented so future maintenance personnel can quickly identify the field device associated with each input.
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 | Processes analog input data |
| Voltage Transmitter | Provides a compatible analog measurement signal |
| Analog Sensor | Generates a continuous voltage signal |
| STB Analog Output Module | Provides an analog control signal for related closed-loop applications |
Recommended Related Models
| Model / Product Family | Product Type | Typical Application |
|---|---|---|
| Schneider STBACI1400 | Standard Analog Input Module | Multi-channel analog current signal acquisition |
| Schneider STBACO0220 | Standard Analog Output Module | Two-channel analog current output |
| Schneider STBACO1225 | Basic Analog Output Module | Multi-channel analog current output |
| Schneider STBAVI1255 | Basic Analog Input Module | Four-channel 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 voltage input channels.
- Suitable for continuous measurement signals.
- Integrates with the Modicon STB distributed I/O architecture.
- Suitable for PLC and PAC-based monitoring and control.
- Useful for process instrumentation and machine sensors.
- Supports distributed analog signal acquisition.
- Can be used as the measurement stage of closed-loop control.
- Suitable for machine and process automation applications.
Technical FAQs
What type of signals does the STBAVI1255 receive?
The STBAVI1255 is a Basic Analog Input Module for voltage signals. The connected field device must provide a voltage output compatible with the module’s configured input requirements.
How should the STBAVI1255 be used with a voltage transmitter?
The transmitter is connected to an assigned analog input channel, and the controller reads the corresponding input value through the STB island. The PLC or PAC program then scales the electrical signal into the required engineering unit, such as pressure, temperature, level, or another process variable.
What should be checked when the PLC displays an incorrect analog value?
Start by measuring the actual voltage at the field connection. If the measured signal is already incorrect, inspect the transmitter and field wiring. If the electrical signal is correct, check the STBAVI1255 channel configuration, PLC scaling, I/O mapping, and STB communication.
Can the STBAVI1255 be used in a closed-loop control system?
Yes. The STBAVI1255 can acquire the process measurement used by a control loop. The PLC or PAC can compare that measurement with a setpoint and calculate the required control response. A compatible STB analog output module can then send the resulting command to the field actuator.