OMRON C200H-AD003 Analog Input Unit

The OMRON C200H-AD003 is an 8-channel analog input module for the C200H SYSMAC PLC series. Designed to convert external analog sensor signals (voltage or current) into digital values for processing by the CPU, this unit provides high-resolution measurement and flexible input range selection. It is an ideal expansion for industrial applications requiring monitoring of temperature, pressure, flow, or position transducers. The AD003 mounts directly to the C200H backplane and communicates via the internal bus, ensuring fast and accurate data acquisition.

Technical Specifications

Key Features and Benefits

• 8 High‑Density Inputs: Reduces space compared to using multiple 4‑channel modules.

• Flexible Signal Conditioning: Each channel independently set for voltage or current without external resistors.

• Fast Conversion: 1 ms per channel ensures real‑time monitoring for dynamic processes.

• Built‑In Averaging: Programmable averaging function reduces noise effects on measurement.

• Diagnostic LED Indicators: Status of power, conversion, and external power supply.

Functional Overview

The C200H-AD003 receives 8 analog signals from field transmitters. Each channel has a dedicated A/D converter, eliminating channel‑to‑channel switching delays. The module scales the measured value to a 12‑bit binary value (0-4095) that the CPU reads via IR or DM area. The user can set up to 18 different input ranges through the module’s DIP switches and software configuration. The AD003 also supports offset/gain adjustment for calibration. When used with C200H CPU units, the analog data is refreshed in the I/O memory each scan, allowing immediate use in PID loops or alarm comparisons.

Compatibility and Integration

This unit is compatible with all C200H, C200HE, C200HG, and C200HX CPU units. It occupies one slot in the rack and uses 10 IR words and 10 DM words for setup and data storage. The module includes removable terminal blocks for easy wiring. It works with standard 2‑wire (loop powered) and 4‑wire transmitters. No special programming is required – the analog values are directly accessible as 16‑bit signed integers. For high accuracy applications, scaling to engineering units can be done using ladder logic or by using OMRON’s SCL instruction.

Installation and Configuration

Installation involves placing the module into an empty slot and setting the unit number switch (0-9) to assign I/O addresses. Shielded twisted-pair cables are recommended for analog signals to minimize noise. The external 24 V DC power must be supplied to the module’s dedicated terminals; this power drives the analog circuits. Configuration is performed via DIP switches on the front panel to select voltage/current per channel, and the PLC software to set averaging, scaling, and range specifications. After power-up, the module performs a self‑test and displays a ready LED.

Maintenance and Reliability

The C200H-AD003 is solid‑state and requires no routine maintenance other than periodic visual inspection of wiring and terminal tightness. Accuracy should be checked annually against a calibrated source. The module includes overvoltage protection on input channels (up to ±30 V). In the event of an external power failure, the module reports a diagnostic error to the CPU. Long-term reliability is supported by OMRON’s legacy C200H platform, known for its robust construction.

Conclusion

The OMRON C200H-AD003 analog input unit offers a cost‑effective and reliable way to add 8 high‑resolution analog channels to C200H PLC systems. With flexible range selection, fast conversion, and easy integration, it is a practical solution for upgrading legacy machinery or expanding analog monitoring capabilities in industrial automation.