OMRON CQM1-ME04K / CQM1-ME08K – RAM Program Memory Module | CQM1 PLC Platform
Engineering Background
The OMRON CQM1 series is a compact, high-performance programmable logic controller platform widely deployed in discrete manufacturing, packaging machinery, and process control applications across Asia-Pacific and global industrial markets. Introduced as part of OMRON’s C-series PLC family, the CQM1 CPU units require dedicated memory modules to store ladder logic programs, I/O tables, and data memory — making the CQM1-ME04K and CQM1-ME08K essential consumable components for system commissioning, program backup, and field replacement.
Product Positioning
The CQM1-ME04K (4K words) and CQM1-ME08K (8K words) are battery-backed RAM memory modules designed exclusively for OMRON CQM1 CPU units. They enable engineers to store, transfer, and protect PLC programs without reliance on external programming devices during runtime. Konmask.com supplies both variants as genuine or equivalent-grade units, verified for compatibility with the full CQM1 CPU lineup.
Complete Technical Specifications
| Parameter | CQM1-ME04K | CQM1-ME08K |
|---|---|---|
| Memory Type | Battery-backed RAM | Battery-backed RAM |
| Program Capacity | 4K words (4,096 words) | 8K words (8,192 words) |
| Compatible CPU | CQM1-CPU11/21/41/42/43/44 | CQM1-CPU41/42/43/44 |
| Data Retention | Battery-backed (lithium cell) | Battery-backed (lithium cell) |
| Module Form Factor | Plug-in cassette | Plug-in cassette |
| Operating Temperature | 0 – 55 °C | 0 – 55 °C |
| Storage Temperature | -20 – 75 °C | -20 – 75 °C |
| Humidity | 10 – 90% RH (non-condensing) | 10 – 90% RH (non-condensing) |
| Country of Origin | Japan | Japan |
| Weight (approx.) | ~200 g (packaged) | ~200 g (packaged) |
Proven Application Environments
- Discrete Manufacturing: Automotive assembly lines, stamping presses, and conveyor control systems using CQM1 CPUs requiring field-replaceable program storage.
- Packaging Machinery: Form-fill-seal machines and labeling equipment where program backup modules are mandatory for rapid changeover.
- Textile & Printing: Legacy CQM1-based machine controllers in textile mills and printing presses across Southeast Asia.
- Building Automation: HVAC and access control panels using CQM1 PLCs in retrofit and maintenance scenarios.
- OEM Spare Parts Programs: Machine builders maintaining installed base of CQM1-equipped equipment requiring certified memory module replacements.
Engineering Advantages
- Direct Plug-in Replacement: Cassette form factor allows hot-swap-style replacement without CPU disassembly — minimizing downtime during field service.
- Battery-Backed Retention: Onboard lithium battery ensures program integrity during power loss, eliminating re-programming risk.
- Dual-SKU Coverage: ME04K covers standard CQM1 CPU models; ME08K extends to high-capacity CPU41–44 variants — one supplier for both capacity tiers.
- Genuine OMRON Lineage: Manufactured to OMRON’s original specifications, ensuring full compatibility with CX-Programmer and SYSMAC Support Software (SSS).
- Long Shelf Life: Sealed packaging with ESD protection maintains module integrity during storage and transit.
System Architecture & Signal Flow
In the CQM1 architecture, the memory module slots into the CPU unit’s dedicated memory cassette port. Upon power-up, the CPU reads the program stored in the module’s RAM into the execution engine. The battery-backed RAM maintains all stored data — including ladder program, I/O table, and DM area contents — independently of the CPU’s main power supply. Program transfers are performed via the peripheral port using CX-Programmer (Windows) or legacy SSS software. The ME08K variant supports extended instruction sets available only on CQM1-CPU41 and above.
Sourcing & Quality Verification
- All units are sourced through verified industrial automation supply channels with full traceability.
- Pre-shipment inspection includes visual examination, label verification, and where applicable, functional power-on testing.
- ESD-safe packaging with anti-static bags and foam inserts for international shipping.
- Batch documentation available upon request for MRO and OEM procurement teams.
- Konmask.com maintains stock of both CQM1-ME04K and CQM1-ME08K for immediate dispatch.
Procurement Process
- Confirm CPU Model: Verify your CQM1 CPU part number (CPU11–CPU44) to select the correct memory capacity (4K or 8K words).
- Request Quote: Contact support@konmask.com for volume pricing, lead time, and availability confirmation.
- Place Order: Orders accepted via the Konmask.com storefront, email PO, or direct inquiry. Payment via T/T, PayPal, or trade terms for qualified accounts.
- Shipping: DHL / FedEx / EMS international express from China. Typical transit: 3–7 business days to most destinations.
- After-Sales: 30-day return policy for unused, unopened units. Technical support available via email and WhatsApp.
Technical FAQ
Q: Can the CQM1-ME04K be used in a CQM1-CPU44?
A: The CPU44 supports both ME04K and ME08K. However, if your program exceeds 4K words, the ME08K is required. Always verify program size in CX-Programmer before selecting the module.
Q: Is the battery replaceable in the memory module?
A: The lithium battery in CQM1 memory modules is not field-replaceable. When battery life expires (typically 5–10 years), the entire module should be replaced. Konmask.com recommends keeping a spare unit on-site.
Q: Are these modules compatible with CQM1H CPUs?
A: No. The CQM1H series uses a different memory module format (CQM1H-MEA03/MEA08). CQM1-ME04K and ME08K are exclusively for the original CQM1 CPU series.
Q: Can I transfer a program from ME04K to ME08K?
A: Yes. Programs stored on ME04K can be uploaded to CX-Programmer and then downloaded to ME08K without modification, provided the program is within 4K words.
Q: What programming software is required?
A: OMRON CX-Programmer (part of CX-One suite) or legacy SYSMAC Support Software (SSS) for older installations. Both are compatible with CQM1 memory modules.
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