Configured for direct execution of stored program ladder logic and high-speed motion pulse handling in CQM1 system backplanes, the Omron CQM1-CPU43-EV1 (CQM1-CPU43-EV1 CPU Unit) provides direct physical/electrical execution. It executes cyclic scan operations with direct output updating and immediate interrupt processing across up to 256 total I/O points across a maximum of 11 expansion modules. The unit integrates dedicated pulse I/O ports supporting high-speed encoder feedback inputs up to 50 kHz single-phase (25 kHz two-phase) and CW/CCW pulse outputs up to 50 kHz for precision stepper and servo position loops.

Technical Identifier Matrix

• Base Model: CQM1-CPU43-EV1
• Brand: Omron
• Series: CQM1 Series
• Hardware Profile: CPU Unit with Built-in Pulse I/O Ports
• Control Method: Stored program method via cyclic scan and direct interrupt processing

Hardware Specifications

Backplane Bus Velocity and I/O Density Scaling

The Omron CQM1-CPU43-EV1 controls backplane data bus operations via cyclic scanning supplemented by direct output refresh cycles and immediate interrupts. High-density I/O expansion supports up to 11 total I/O or Special I/O modules constrained to a maximum of 15 I/O words across the backplane bus. Built-in pulse I/O hardware connects directly to the central processing pipeline, eliminating internal backplane communication latencies for position control functions. This architecture allows simultaneous reading of high-speed counter PVs (up to 50 kHz) and real-time updating of CW/CCW pulse train outputs without interrupting execution cycles for ladder logic instructions.

Package Contents & Ordering Information

• 1x Omron CQM1-CPU43-EV1 CPU Unit
• 1x Installed Memory Backup Lithium Battery
• 1x Protective Terminal Block Cover Assembly
• 1x Installation Manual

Field Installation Guidelines

• Mounting: Secure the CPU unit onto a standard 35 mm DIN rail or chassis panel. Maintain a minimum top and bottom clearance of 20 mm for heat dissipation.
• Wiring: Route 24 VDC pulse input signal lines (Encoder A, B, Z) and NPN open collector output lines separately from high-voltage AC lines using shielded wiring.
• Grounding: Wire the functional ground (FG) terminal directly to a low-impedance earth ground using a minimum 2.0 mm sq conductor. Keep ground resistance under 100 ohms.
• Shielding: Terminate pulse I/O signal cable shields using 360-deg braid shielding clamps grounded directly to the panel backplate to minimize electromagnetic interference.

Frequently Asked Questions

• What action is required when the BAT ERR indicator illuminates on the CPU front panel?

  Replace the internal memory backup battery with a new unit within 1 week, ensuring the new battery is connected within 5 minutes of removal to preserve RAM contents.

• What is the maximum output frequency supported by the built-in pulse output ports?

  The NPN open collector pulse outputs support up to 50 kHz maximum, or up to 20 kHz when directly driving stepping motor drives.

• What are the ON and OFF voltage thresholds for the pulse input channels?

  The 24 VDC pulse inputs require an ON voltage of 20.4 VDC minimum and an OFF voltage of 4.0 VDC maximum.

• How many total expansion modules can be connected to the CQM1-CPU43-EV1 CPU?

  A maximum of 11 I/O or Special I/O modules can be attached, provided the total I/O allocation does not exceed 15 words (256 points).

• Can the CQM1-CPU43-EV1 perform immediate output refreshing during program execution?

  Yes, the CPU supports direct output updating and immediate interrupt processing outside standard end-of-scan refreshing.

• What internal memory areas are protected by the backup battery during power failure?

  The holding bits (HR), auxiliary bits (AR), data memory (DM), counter preset/present values, and real-time clock (RTC) data are retained.

• What is the current consumption of the CQM1-CPU43-EV1 from the internal 5 VDC backplane bus?

  The CPU module draws 980 mA from the internal 5 VDC backplane power supply rail.

• What external power supply is required to drive the built-in pulse I/O interface?

  The pulse output interface requires an external power supply of 5 VDC (+/-10%) at 30 mA minimum or 24 VDC (+10%/-15%) at 30 mA minimum.