OMRON C200H Series Modules C200H-MR833

Technical Dossier

Product Details And Specifications

OMRON C200H Series Technical Notes

The OMRON C200H is a mid-range modular programmable logic controller series that achieved widespread deployment across global heavy industry sectors including petrochemical refining, nuclear auxiliary systems, pharmaceutical batch processing, and continuous-process manufacturing. Introduced in the late 1980s and reaching peak installed base through the 1990s, the C200H platform became a de facto standard for medium-complexity automation tasks requiring deterministic scan times, robust I/O expansion, and multi-rack configurations. Installations remain active in refineries across the Middle East, chemical complexes in Europe, and legacy power generation facilities throughout Asia-Pacific. The C200H-MR833 is a memory cassette module within this platform, providing battery-backed RAM storage for ladder logic programs and data retention across power cycles — a critical component for any facility maintaining long-term C200H system integrity.

The Evolution of C200H Architecture

The C200H platform was developed as a successor to the OMRON C200 and C120 series, introducing a backplane-based rack architecture that allowed modular expansion across up to 3 expansion racks (plus the CPU rack), supporting up to 512 I/O points in standard configuration and up to 1,184 points with high-density modules. The CPU rack accepts a dedicated CPU module, power supply, and up to 10 I/O or special function modules per rack.

Architecturally, the C200H uses a proprietary parallel backplane bus for I/O communication, distinguishing it from later OMRON platforms (C200HX/HG/HE, CS1, CJ1) that migrated to higher-speed internal buses and eventually EtherNet/IP connectivity. This backplane design creates a hard compatibility boundary: C200H modules are not electrically or mechanically interchangeable with C200HX/HG/HE modules without verified cross-reference. The CS1 and CJ1 series represent the modern architectural successors, with CS1 offering a direct migration path for large C200H installations via adapter units.

Memory architecture evolved across CPU generations: early C200H CPUs used EPROM-based program storage requiring UV erasure, while later models (CPU01-E, CPU03-E, CPU11-E, CPU23-E, CPU31-E, CPU43-E) supported battery-backed RAM cassettes such as the C200H-MR833 and flash memory options. The MR833 specifically provides 32K-word RAM capacity with battery backup, compatible with the CPU-E suffix generation of C200H processors.

C200H Full Catalog & Functionalities (SKU List)

CPU Modules

• C200H-CPU01-E: Entry-level CPU, 512 I/O pts, 3.2K word program memory
• C200H-CPU03-E: Standard CPU, 512 I/O pts, 6.4K word program memory
• C200H-CPU11-E: Mid-range CPU, 512 I/O pts, 15.2K word program memory
• C200H-CPU23-E: Enhanced CPU with data link, 512 I/O pts, 30.2K word program
• C200H-CPU31-E: High-capacity CPU, 512 I/O pts, 62.2K word program memory
• C200H-CPU43-E: Top-tier CPU, 512 I/O pts, 62.2K word + extended data memory

Memory Cassette Modules

• C200H-MR833: 32K-word battery-backed RAM cassette for CPU-E series
• C200H-MR431: 4K-word RAM cassette, early CPU compatibility
• C200H-MP831: EPROM cassette, 32K-word, UV-erasable program storage

Digital Input Modules

• C200H-ID212: 16-pt DC 12/24V input module, NPN/PNP selectable
• C200H-ID215: 16-pt DC 24V input, high-speed response, 0.5ms filter
• C200H-ID501: 32-pt DC 12/24V input, high-density format

Digital Output Modules

• C200H-OD212: 16-pt transistor output, NPN, 0.5A per point, DC 12/24V
• C200H-OD215: 16-pt transistor output, PNP, 0.5A per point, DC 24V
• C200H-OA222: 8-pt triac output, AC 100-240V, 0.5A per point
• C200H-OC222: 8-pt relay output, 2A per point, AC/DC mixed load

Analog Modules

• C200H-AD003: 4-ch analog input, 12-bit resolution, 0–10V / 4–20mA
• C200H-DA003: 2-ch analog output, 12-bit resolution, 0–10V / 4–20mA

Communication & Special Function Modules

• C200H-LK201-V1: Host Link / RS-232C communication module
• C200H-ASC11: ASCII / BASIC module for serial protocol handling
• C200H-CT001-V1: High-speed counter module, 50kHz single-phase input

Power Supply Modules

• C200H-PA204: AC 100-240V input power supply, 5VDC 4.6A output
• C200H-PD024: DC 24V input power supply, 5VDC 3.6A output

Sourcing Hard-to-Find & Obsolete C200H Parts

OMRON officially discontinued the C200H series and transitioned support to the CS1/CJ1 platform. As of 2026, the C200H is classified as end-of-life (EOL) with no new production. This creates a critical supply gap for facilities that cannot justify a full control system migration — a capital-intensive project that may require revalidation under IEC 61511 (functional safety) or FDA 21 CFR Part 11 (pharmaceutical) frameworks.

Quality Control for the C200H Range

• Backplane bus integrity test: Each module is seated in a live C200H test rack and scanned for bus communication errors, addressing conflicts, and I/O response latency outside specification.
• CPU functional verification: CPU modules are loaded with a standardized ladder test program covering timer, counter, data move, and arithmetic instructions. Scan time is measured and compared against published specifications.
• Memory cassette validation: RAM cassettes including the C200H-MR833 undergo full read/write cycle testing across the entire address space. Battery voltage is measured; batteries below 2.8V are replaced with OEM-equivalent lithium cells.
• I/O point-level testing: All digital input and output points are individually exercised. Analog modules are calibrated against a traceable reference standard with linearity and offset error recorded.
• Visual and mechanical inspection: Connector pins, backplane edge connectors, and module housings are inspected for corrosion, mechanical damage, and counterfeit indicators.