The Omron CPM2A-20CDR-A, also cataloged as the CPM2A-20CDR-A Programmable Controller, operates as a dedicated hardware component for real-time discrete automation and direct physical signal switching within CPM2A Series industrial platforms. The unit processes 12 discrete 24 VDC inputs and drives 8 electromechanical relay output channels, handling high-speed instruction execution and encoder pulse counting across an AC line power input.

Technical Identifier Matrix

Hardware Specifications

I/O Density Scaling and Backplane Bus Velocity

The Omron CPM2A-20CDR-A features an integrated CPU processor designed for rapid instruction cycling, achieving basic logic execution speeds between 0.26 us and 0.64 us. High backplane bus velocity enables synchronous updates between local processing registers and external field devices. The controller supports I/O density scaling by accepting up to 3 expansion units directly attached to the expansion bus interface, increasing discrete point density without introducing latency into the high-speed 20 kHz encoder input channel.

Package Contents & Ordering Information

• 1x Omron CPM2A-20CDR-A Controller Unit
• 1x Removable Screw Terminal Cover Set
• 1x Hardware Installation Datasheet

Field Installation Guidelines

• Mechanical Installation: Mount horizontally on a 35 mm DIN rail or fasten directly to an enclosure backpanel using M4 mounting hardware. Provide a minimum vertical clearance of 50 mm above and below the chassis for passive convective cooling.
• AC Utility Wiring: Connect main utility power (85 to 264 VAC) to terminals L1 and L2/N. Ensure line power cabling is segregated from DC signal and output lines.
• Relay Output Wiring: Connect load circuits to individual output relay terminals. Wire protective RC snubbers across AC inductive loads and flywheel diodes across DC inductive loads to absorb counter-EMF transients.
• System Grounding: Connect a dedicated ground wire (minimum 2.0 mm sq) directly from the functional earth terminal to the panel main ground bus bar.
• Encoder Wiring & Shielding: Terminate high-speed encoder input lines using Shielded Twisted Pair (STP) wiring. Connect the cable shield braid to earth ground using a 360-deg grounding clamp.

Frequently Asked Questions

• Q: What line voltage range is supported by the CPM2A-20CDR-A power supply?

  A: The integrated AC power unit operates over an input line range of 85 to 264 VAC at 50/60 Hz.

• Q: What is the rating and contact type of the discrete output channels?

  A: The module features 8 electromechanical relay outputs rated for 2 A per point at 250 VAC or 24 VDC.

• Q: What basic logic execution speed does the CPU achieve?

  A: Basic ladder logic instructions execute at a rate of 0.26 us to 0.64 us per instruction.

• Q: Does the CPU unit support high-speed encoder input signals?

  A: Yes, the unit includes 1 built-in high-speed counter input channel rated up to 20 kHz.

• Q: How many expansion modules can be connected to the base CPU chassis?

  A: Up to 3 CPM1A expansion I/O units or specialty modules can be appended via the expansion port.

• Q: What are the program and data memory allocations for user applications?

  A: Non-volatile memory reserves 4 kWords for user program storage and 2 kWords for data memory.

• Q: What is the permissible ambient operating temperature range?

  A: Operating environments must maintain an ambient temperature range from 0 deg C to 55 deg C.

• Q: What shielding practice is required for signal cabling to prevent noise coupling?

  A: Signal cabling must utilize STP conductors with cable shields grounded via 360-deg braid shield termination clamps.