OMRON C200H-MR833 EEPROM Memory Cassette for C200H
The OMRON C200H-MR833 EEPROM Memory Cassette is a purpose-built program storage component designed to operate within the OMRON C200H modular PLC platform. Rather than functioning as a standalone accessory, the C200H-MR833 serves a critical role in the broader control system architecture — enabling reliable, non-volatile program retention across the CPU layer, I/O layer, communication layer, and power distribution layer of a fully integrated industrial automation system. For engineers designing or maintaining C200H-based control panels in manufacturing, power distribution, water treatment, or process industries, the C200H-MR833 provides the program integrity and field-transfer capability that underpins long-term system stability.
In a layered automation architecture, the C200H-MR833 interfaces directly with the C200H CPU unit — such as the C200H-CPU01 or C200H-CPU03 — to store ladder logic programs in EEPROM format. Unlike battery-backed RAM, EEPROM retains program data without power, eliminating the risk of program loss during extended shutdowns or battery failure events. This characteristic is especially valuable in remote installations, unmanned substations, and outdoor control enclosures where battery maintenance is operationally difficult.
The cassette’s role extends beyond simple storage. During system commissioning or post-maintenance restart, the C200H-MR833 enables rapid program transfer back to the CPU, reducing downtime and eliminating the need for a programming terminal on-site. This capability is particularly relevant in multi-machine production lines where identical control logic must be deployed across several C200H racks simultaneously — a common requirement in packaging lines, conveyor systems, and injection moulding cells.
Product Specification Table
| Parameter |
Specification |
| Model |
C200H-MR833 |
| Brand |
OMRON |
| Series |
C200H |
| System Role |
Non-volatile EEPROM Program Memory Cassette |
| Memory Type |
EEPROM (Electrically Erasable Programmable Read-Only Memory) |
| Compatible CPU Units |
C200H-CPU01, C200H-CPU03, C200H-CPU11, C200H-CPU21 |
| Program Capacity |
8K Steps |
| Data Retention |
Non-volatile; no battery required |
| Write Cycles |
Approx. 10,000 erase/write cycles |
| Installation |
Direct cassette slot on C200H CPU front panel |
| Operating Temperature |
0°C to 55°C |
| Storage Temperature |
-20°C to 75°C |
| Communication Compatibility |
Compatible with SYSMAC C200H system bus architecture |
| Origin |
Japan |
| Warranty |
warranty terms confirmed during quotation |
System Compatibility Notes
The C200H-MR833 achieves its full value when considered within the complete C200H rack-based control system. A typical C200H architecture begins with the power supply unit — commonly the C200H-PS221 or C200H-PS211 — which provides regulated 5 VDC to the backplane and all installed modules. The CPU unit, such as the C200H-CPU01, occupies the leftmost slot of the C200H-BC081 8-slot backplane or the C200H-BC101 10-slot backplane, with the MR833 cassette inserted directly into the CPU’s memory slot.
On the I/O layer, digital input modules such as the C200H-ID212 (24 VDC, 16-point) and digital output modules such as the C200H-OD212 (transistor output, 16-point) populate the remaining backplane slots, providing the field signal interface for sensors, actuators, solenoids, and motor starters. Analogue I/O requirements are addressed by modules such as the C200H-AD003 or C200H-DA003, which handle 4–20 mA process signals from flow transmitters, pressure sensors, and temperature elements.
At the communication layer, the C200H-LK201 Host Link module or the C200HW-COM06 RS-232C/RS-422 communication board enables SCADA connectivity, HMI integration, and peer-to-peer PLC networking. These communication modules allow the C200H system to exchange data with operator panels, supervisory systems, and upstream MES platforms — all while the C200H-MR833 ensures that the resident control program remains intact regardless of communication faults or power interruptions.
For temperature-sensitive process applications, the C200H-TS002 thermocouple input module integrates directly into the same rack, providing closed-loop temperature control without requiring an external controller. In redundant or safety-critical architectures, engineers may deploy dual C200H racks with synchronised program cassettes, using the MR833 as the master program reference to ensure both systems run identical logic versions — a practice common in water treatment pump stations and chemical dosing systems.
The C200H-MR833 also supports cross-platform program migration. In facilities transitioning from C200H to CS1 or CJ1 series platforms, the cassette serves as a program archive medium, preserving legacy logic for reference during re-engineering. The CS1W-SCB21 serial communication board and CQM1-PA206 power supply are examples of components from adjacent OMRON platforms that may coexist in the same control cabinet during phased migration projects.
Industrial Application Notes
In manufacturing and assembly automation, the C200H-MR833 is deployed in C200H-controlled conveyor systems, robotic welding cells, and press brake controllers where program integrity is non-negotiable. A single corrupted program can halt an entire production line; the EEPROM cassette eliminates this risk by providing a hardware-level program backup that survives power loss, CPU replacement, and firmware updates.
In power distribution and electrical substation applications, C200H systems equipped with the MR833 cassette manage transformer switching sequences, capacitor bank control, and feeder protection logic. The non-volatile memory characteristic is essential in these environments, where PLCs may remain de-energised for months between maintenance cycles.
In water and wastewater treatment facilities, C200H-MR833-equipped controllers manage pump sequencing, chemical dosing, and filtration cycle timing. The ability to restore a known-good program from the cassette after a CPU fault significantly reduces mean time to repair (MTTR) in unmanned pump stations.
In petrochemical and oil & gas process plants, the C200H platform with MR833 memory cassettes supports batch process control, valve sequencing, and compressor management. The cassette’s resistance to vibration and its solid-state construction make it suitable for installation in control panels mounted on skid-mounted process equipment.
In mining and metallurgical operations, C200H systems control conveyor drives, crusher sequencing, and ore sorting equipment. The MR833 cassette enables rapid program restoration after lightning-induced CPU damage — a common failure mode in open-pit mining environments with limited surge protection infrastructure.
Product Compatibility FAQ
Q1: Is the C200H-MR833 compatible with all C200H CPU variants, and can it be used interchangeably across different CPU models?
The C200H-MR833 is compatible with the C200H-CPU01, CPU03, CPU11, and CPU21 units. Program transfer between CPU models is possible provided the program does not exceed the target CPU’s memory capacity and the I/O configuration is consistent. Engineers should verify the instruction set compatibility between CPU variants before transferring programs across different CPU generations within the C200H family.
Q2: How does the C200H-MR833 support system redundancy and long-term maintenance strategies?
The MR833 cassette supports a practical form of program redundancy by serving as an off-CPU program master. In maintenance workflows, a spare CPU unit can be pre-loaded with the production program from the cassette and held in inventory, enabling hot-swap replacement without requiring a programming terminal or laptop on-site. This approach is particularly effective in remote installations and facilities with limited engineering support. Combined with a warranty terms confirmed during quotation on the supplied cassette, this strategy significantly reduces lifecycle risk for C200H-based control systems.
Q3: What is the recommended procedure for writing and verifying a program on the C200H-MR833 before deployment?
The recommended procedure involves connecting the C200H CPU to a programming terminal running SYSMAC Support Software (SSS) or CX-Programmer in C200H compatibility mode. With the CPU in PROGRAM mode, the engineer transfers the verified ladder program from the CPU RAM to the MR833 cassette using the memory cassette write function. After writing, the cassette should be removed and re-inserted to trigger an automatic program load, and the CPU should be cycled to confirm successful program restoration. All I/O points should be verified against the field wiring schedule before returning the system to RUN mode. This procedure ensures system integration between the stored program and the live control architecture.
