Omron C200H-OC226N

The Omron C200H-OC226N is a high-density Relay Contact Output Module belonging to the legendary SYSMAC C200H series.¹ While this series is considered “legacy” (now superseded by the CS1 and CJ series), thousands of these modules remain in active service worldwide due to their incredible durability and the long lifespan of Omron PLC hardware.

The “OC” in the model name identifies it as an Output Module using mechanical relays.

1. Specifications and Capacity

This module is designed to switch medium-power loads directly without the need for interposing relays in many applications.

• Output Points: 16 points.²

   

• Switching Capacity (Max): 2A at 250V AC or 2A at 24V DC.

• Minimum Load: 10mA at 5V DC.

• Response Time: * ON: 15ms maximum.

  • OFF: 15ms maximum.

• Electrical Life: 100,000 operations at the maximum resistive load.

2. Internal Structure and Isolation

• Isolation Method: Mechanical (Relay). Because it uses physical contacts, there is complete galvanic isolation between the PLC’s internal logic and the external load.

• Common Points: The 16 outputs are divided into 2 groups of 8, each with its own “Common” (COM) terminal. This allows you to use two different voltages (e.g., 24V DC on one group and 230V AC on the other) on the same module.

• Indicators: 16 Red LEDs on the front panel display the ON/OFF status of each output point.

3. Wiring and Connection

The module uses a removable terminal block with 19 screws. This design is highly beneficial for maintenance because you can replace a faulty module without disconnecting the individual field wires.

4. Technical Specifications Table

5. Key Maintenance Notes

• Relay Wear: Mechanical relays have a finite lifespan. If a specific output stays “ON” even when the PLC logic is “OFF,” the internal relay contact has likely welded shut.

• Noise Suppression: If you are switching inductive loads (like solenoid valves or motor starters), it is highly recommended to use surge suppressors (RC snubbers for AC or flyback diodes for DC) to prevent electrical noise from interfering with the PLC.

• Compatibility: This module is compatible with C200H, C200HS, C200HX/HG/HE, and CS1 (with a C200H backplane) racks.

Replacement Advice:

Since the C200H series is discontinued, finding brand-new units is difficult. If you are looking for a modern replacement, you would typically migrate to the CS1W-OC211 (for CS1 racks) or the CJ1W-OC211 (for CJ series), though these require a different rack or base.