Configured for discrete instruction processing and high-speed signal execution in standalone automation panels, the Omron CPM1A-20CDR-D (CPM1A-20CDR-D Micro Programmable Controller) provides direct physical/electrical execution across integrated DC inputs and relay outputs.

Technical Identifier Matrix

Hardware Specifications

Backplane Bus Velocity and I/O Density Scaling

The Omron CPM1A-20CDR-D utilizes an integrated CPU and I/O expansion bus structure designed for rapid local I/O update execution. Signal routing across the CPU core and dedicated expansion connector maintains consistent cycle times during full 20-point updates. High-speed input channels process up to 5 kHz input frequencies for direct encoder interface tasks without adding scan overhead. The architecture scales I/O density by connecting CPM1A expansion I/O units, preserving deterministic ladder logic processing up to maximum expansion limits.

Package Contents & Ordering Information

• 1x Omron CPM1A-20CDR-D Main Controller Unit
• 1x Screw Terminal Block Cover
• 1x Hardware Installation Sheet

Field Installation Guidelines

• Mounting: Snap the base unit onto a standard 35 mm DIN rail (IEC 60715) or secure via M4 mounting screws through the integral mounting feet. Maintain 50 mm clearance around the housing for thermal ventilation.
• Wiring: Connect 24 VDC main supply power to the designated L1/N (DC+, DC-) terminals. Use copper conductors rated for 75 deg C with a wire cross-section of 0.5 to 1.25 mm sq.
• Relay Protection: Install inductive surge suppressors (diodes for DC loads, RC snubbers for AC loads) directly across external field load coils to prevent contact pitting and back-EMF feedback.
• Grounding & Shielding: Connect the Functional Earth (FE) terminal to an earth ground maintaining less than 100 ohms loop impedance. Secure signal cable shields with 360-deg grounding clamps.

Frequently Asked Questions

• What is the primary power supply voltage required for the CPM1A-20CDR-D?

  The controller operates on an external 24 VDC input supply (acceptable voltage range 20.4 VDC to 26.4 VDC).

• How many physical inputs and outputs are built directly into the base unit?

  The CPM1A-20CDR-D features 20 total integrated I/O points, divided into 12 DC inputs and 8 relay outputs.

• Can the CPM1A-20CDR-D be hot-swapped during live backplane operation?

  No, power must be disconnected from the controller and field wiring before mounting or servicing the device.

• What is the maximum switching capacity of the integrated relay outputs?

  Each relay output supports up to 2 A per point at 250 VAC or 24 VDC max resistive load.

• What high-speed counter input frequency is supported by the CPU?

  The onboard high-speed counter input processes single-phase pulses at a maximum frequency of 5 kHz.

• How is program data protected during a power failure event?

  User program memory is retained in non-volatile flash ROM, while battery-backed RAM preserves data memory areas.

• What gauge wire should be used for power supply and field terminal block connections?

  Use stranded or solid copper wire with cross-sectional areas between 0.5 mm sq and 1.25 mm sq (AWG 20 to AWG 16).

• What grounding specification applies to the installation of this controller?

  The Functional Earth terminal must be connected to an earth ground with a ground resistance of less than 100 ohms.