Omron CP1L-EL20DR-D Compact PLC with Ethernet and Relay Outputs

The Omron CP1L-EL20DR-D is a CPU unit from the CP1L series of compact programmable logic controllers. It features 20 built-in I/O points: 12 digital inputs (24V DC) and 8 relay outputs (2A per point). An integrated Ethernet port (100BASE-TX) enables easy connection to HMIs, SCADA systems, and remote maintenance. This PLC is designed for small to medium machine control.

CPU Performance and Memory

Execution speed: 0.1 µs for basic instructions. Program capacity: 10K steps (user program). Data memory: 32K words (DM). 2K words of retentive memory (H area). Built-in real-time clock with battery backup (for CP1L-EL20DR-D version with clock). Up to 3 interrupt tasks with response time<200 µs. The CPU supports up to 32K of expansion I/O via CP1W modules.

Integrated I/O Specifications

Digital inputs: 12 points, 24V DC (sink/source selectable), 4.1mA typical. Filter time adjustable from 0 to 32 ms. High-speed counters: 2 channels at 100kHz each (single-phase) or 50kHz for differential phase. Digital outputs: 8 relay points, 2A resistive load at 250V AC or 24V DC, 0.5A inductive load. Output operational life: mechanical 20 million operations, electrical 100,000 at rated load.

Ethernet Communication

Port type: RJ45, 100BASE-TX (autonegotiation). Protocols supported: FINS/TCP, FINS/UDP, Modbus TCP (client/server), socket service (TCP/UDP), and automatic SMTP email. Up to 8 simultaneous connections. The Ethernet port can be used for programming (CX-Programmer), data logging, and remote I/O with CJ series EtherNet/IP units via tag data links.

Programming and Software

Compatible with Omron CX-Programmer (version 9.3 or later). Programming languages: Ladder diagram (LD), instruction list (IL), and structured text (ST) for function blocks. The CP1L supports up to 128 function blocks. Online editing and forced set/reset are available via USB or Ethernet. The unit also supports simple positioning with two 100kHz pulse outputs (requires CP1L-EM/EL models with transistor outputs – the EL20DR-D has relay outputs only, not pulse outputs).

Environmental and Power

Power supply: 100-240V AC (built-in), consumption 60VA max. Inrush current limited. Operating temperature: 0°C to 55°C. Storage: -20°C to 75°C. Humidity: 10% to 90% non-condensing. Vibration resistance: 2g at 10-57Hz. Dimensions: 90 x 86 x 75 mm (WxHxD). Weight: 370g. The unit includes a replaceable battery (CP1W-BAT01) for clock backup.

Expansion Capabilities

Up to 3 CP1W series expansion units (digital I/O, analog I/O, temperature sensor, deviceNet, CompoBus/S) can be connected on the right side. Maximum total I/O points: 160 (including expansion). The CP1L-EL20DR-D supports expansion with up to 32 points per module. A CP1W-CIF41 option adds additional Ethernet port. No SD card slot on this model (available on CP1L-EM/EL with higher suffix).

Applications

Typical applications include packaging machinery, conveyors, small assembly stations, garage equipment, HVAC control, and lighting systems. The built-in Ethernet allows easy integration with factory networks. The relay outputs are suitable for controlling contactors, small motors, solenoid valves, and indicator lights.

Safety and Compliance

CE marked, UL Listed (File E318109), cUL, NK, LR, and RoHS compliant. The PLC meets EN 61131-2 standards for industrial controllers. It includes a watchdog timer and memory self-diagnosis at startup.

Conclusion

The Omron CP1L-EL20DR-D provides a balanced combination of onboard I/O, relay outputs, and built-in Ethernet. It is an excellent choice for small-scale automation requiring network connectivity without complex configuration.