OMRON C200H-0C224 PLC Output Module – C200H Series

OMRON C200H-0C224: 8-Point Relay Output Module in the C200H Distributed I/O Architecture

The OMRON C200H-0C224 is an 8-channel relay contact output module engineered for the C200H modular PLC platform. Within a C200H control loop, this module occupies the final execution layer — translating CPU-resolved logic states into galvanically isolated relay closures that drive field devices including solenoid valves, motor contactors, indicator lamps, and alarm circuits. Each output channel operates as an independent Form-A (SPST-NO) relay contact, providing complete electrical separation between the PLC backplane bus and the load circuit. This architecture eliminates ground loop interference and allows mixed-voltage field wiring — AC and DC loads can coexist on the same module without cross-contamination of reference potentials.

The module slots directly into any C200H, C200HS, C200HX, C200HG, or C200HE backplane (BC051, BC081, BC101, BC201 variants) and is recognized by the CPU without parameter configuration. Output status is reflected in the PLC’s I/O memory map at the assigned word address, and each channel’s relay state is independently readable for ladder logic feedback and diagnostic rungs. The module draws its logic supply from the backplane 5 VDC bus, while the relay coil drive is internally regulated — the field-side load circuit is entirely self-powered by the connected load source.

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Technical Parameters

Hardware Logical Analysis

The C200H-0C224 implements a relay-per-channel architecture rather than a shared-relay multiplexed design. Each of the eight output channels has a dedicated relay coil and contact assembly, meaning simultaneous switching of all eight channels introduces no mutual interference or coil current contention on the internal drive bus. The relay coils are driven by transistor switches on the module’s logic board, which are in turn controlled by the backplane data latch — a registered output stage that holds the last CPU-written state across scan cycles, preventing output glitching during CPU processing phases.

EMC Design: The relay contact provides inherent galvanic isolation rated at 1,500 VAC between the field circuit and the logic bus. This eliminates conducted noise paths from inductive load switching transients (solenoids, contactors) back into the CPU backplane. The module’s PCB layout routes field-side traces on a physically separated layer from logic-side traces, with a ground plane interposed between them. Snubber networks are not integrated on-module (per OMRON’s design philosophy for relay outputs), so external RC snubbers or varistors are recommended for inductive AC loads exceeding 0.5 A to protect relay contact surfaces and extend electrical life.

Backplane Bus Interface: The C200H backplane uses a parallel I/O bus with a dedicated slot address decoder. The C200H-0C224 responds to its assigned word address in the output area (CIO area) of the CPU’s I/O memory. The module’s internal address decoding logic latches the 8-bit output word on each I/O refresh cycle. The CPU’s I/O refresh is synchronous with the scan cycle — output states are updated once per scan at the I/O refresh phase, not asynchronously. This deterministic update timing is critical for applications where output sequencing must be coordinated with input sampling within the same scan.

Status Indication: Each channel has a dedicated LED indicator on the module face that illuminates when the relay coil is energized (output ON state). This provides local visual diagnostics without requiring a programming device or HMI connection — a practical advantage during commissioning and field troubleshooting. The LED drive circuit is independent of the relay coil circuit, so LED state accurately reflects the logic command state even if the relay contact has failed open due to contact wear.

System Integration Benefits

• Zero-configuration slot insertion: The module is auto-recognized by C200H, C200HS, C200HX, C200HG, and C200HE CPUs upon backplane power-up. No DIP switch addressing or software registration is required — the CPU reads the module type from the backplane slot ID logic and allocates the corresponding I/O word automatically.
• Mixed-voltage field wiring: Relay contact isolation allows individual channels to switch different voltage sources (e.g., 24 VDC on channels 0–3, 120 VAC on channels 4–7) from a single module, reducing the total module count and backplane slot consumption in mixed-signal panels.
• Deterministic output refresh: Output states are updated synchronously with the CPU scan cycle’s I/O refresh phase. This guarantees that all eight relay outputs reflect the same logical scan’s computed results simultaneously, eliminating inter-channel timing skew that could cause sequencing errors in coordinated actuator control.
• Diagnostic transparency via I/O memory: The output word in CIO memory is readable by ladder logic, enabling the program to verify commanded output states, implement output interlocks, and generate fault flags if expected output states are not achieved within a defined time window.
• High noise immunity in relay architecture: Unlike transistor output modules, relay contacts are not susceptible to latch-up or false triggering from fast transient voltages (EFT) on the load circuit. The relay’s mechanical switching action is immune to the sub-microsecond transients that can affect solid-state output stages in high-EMI environments.
• Long-term spare parts availability: The C200H platform has an extensive installed base globally. The C200H-0C224 remains available through authorized distribution channels and specialist industrial component suppliers, supporting long-lifecycle machine maintenance strategies without forced platform migration.
• Broad load compatibility: The 2 A per channel rating at 250 VAC covers the majority of industrial relay switching applications including pilot duty contactors (IEC AC-15 category), solenoid valves, and resistive heating elements. The 10 mA minimum load specification accommodates low-power signal loads such as PLC-to-PLC handshake signals and indicator circuits.
• Reduced wiring complexity: Each relay contact is a dry (potential-free) contact. Field power is supplied externally at the terminal block, not from the module. This simplifies panel wiring documentation, allows field power to be isolated independently of PLC logic power, and facilitates safe maintenance procedures under partial panel energization.

Quality Assurance & Global Logistics

Every OMRON C200H-0C224 unit supplied through siemensplc.com is sourced from verified authorized distribution channels or factory-sealed original stock. Each module undergoes a pre-shipment inspection protocol that includes visual examination of housing integrity, label authenticity verification against OMRON’s serial number database, and connector pin condition assessment. Holographic authenticity labels and batch traceability records are available on request for quality-critical procurement processes.

Our logistics operation is based in Xiamen, China — a major international freight hub with direct air cargo connections to Europe, North America, Southeast Asia, the Middle East, and Oceania. Standard orders ship within 1–3 business days of payment confirmation. Express air freight options (DHL, FedEx, UPS) are available for urgent requirements, with typical transit times of 3–7 business days to most global destinations. Sea freight consolidation is available for bulk orders. All shipments are fully insured and include commercial invoice, packing list, and certificate of origin documentation for customs clearance. Import duty and HS code guidance is provided upon request.

A 12-month warranty against manufacturing defects is provided on all units. Warranty claims are processed with replacement dispatch within 5 business days of defective unit receipt and inspection. Technical pre-sales support — including compatibility verification, backplane slot planning, and I/O budget calculations — is available at no charge from our engineering team.

Contact Information

📧 Email: [email protected]
📱 WhatsApp: +86 18359268345
🌐 Web: siemensplc.com
📍 Location: Xiamen, China
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