Omron CP1E-E20DR-A — 20-I/O PLC, 12 In 8 Relay
SKU: CP1E-E20DR-AUSD 55.00
CP1E-E basic-series compact PLC with 20 I/O (12 inputs + 8 relay outputs), 100 to 240 VAC supply, 2K-step program memory, USB programming — entry-level controller for small machines.
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Product Overview
The CP1E-E20DR-A is the 20-I/O point member of the CP1E-E 'basic-model' CP1E family — a compact 86 × 110 × 95 mm DIN-rail-mounting PLC purpose-built for small, standalone machine control where advanced motion or networking features aren't needed. The point breakdown: 12 × 24 VDC inputs (COM common-group) and 8 × mechanical relay outputs rated 2 A at 250 VAC. The 'A' suffix at the end of the part number specifies the 100 to 240 VAC power supply (the 'D' suffix would be 24 VDC).
E-type vs N-type and S-type CP1E siblings
The CP1E family splits into three sub-families with very different feature sets, all using the same instruction set and chassis footprint. CP1E-E (this SKU) — 2K-step program memory, 2K-word data memory, basic instruction set only, no serial port by default, no Ethernet, ladder programming via USB-only or CX-Programmer. CP1E-N (e.g. CP1E-N20DR-A) — 8K-step program memory, 8K-word data memory, full instruction set, built-in RS-232C + RS-485 ports, built-in Ethernet port (10/100 Mbps Modbus TCP / Host Link), up to 160 I/O via CP1W expansion. CP1E-S (e.g. CP1E-E20SDR-A) — uses the built-in USB port instead of a mini-USB connector for programming, identical specs to the -E variant.
Program and memory capacity
The CP1E-E has 2K steps of program memory (each step is one ladder instruction or function block), 2K words of data memory (split between DM and CH bit/word regions), and a single 0.8 ms scan time for a typical 1K-step program. Expansion memory cards don't apply on the E-type (only on the N-type with memory cassette slot). The supported instruction set covers basic ladder logic, timers/counters (256 of each as a default), comparison, arithmetic, increment/decrement, BCD conversions, and subroutine call — adequate for any sequential control application that doesn't need floating-point math or PID loops (use a CP1L-EM or CP1H for PID).
Key Features
- 20 I/O total — 12 × 24 VDC inputs and 8 × 2 A mechanical relay outputs
- 100 to 240 VAC supply with built-in 24 VDC 0.3 A sensor power output
- 2K-step program memory, 2K-word data memory, 0.8 ms typical scan time
- Built-in USB mini-B port or USB B for programming
- Supports up to 3 CP1W expansion units — CP1W-40EDR, CP1W-AD042, etc.
- 256 timers, 256 counters
- Programmable via CX-Programmer 9.6 or later, also via Sysmac Studio 1.0+
- Built-in 0.3 A sensor power supply 24 VDC for input field devices
- SKU: CP1E-E20DR-A
- Series: CP1E-E (basic-model CP1E)
- Voltage: 100 TO 240 VAC
- I/O: 20 I/O
Best-Fit Applications
- Small packaging machines where 20 I/O is plenty — 12 sensors and 8 outputs for solenoid and indicator control
- Agricultural irrigation controllers — 12 inputs for float switches / pressure sensors, 8 relays for zone valves
- Building automation — HVAC damper control, lighting control, pump sequencing with the 2 A relay outputs
- Standalone machine retrofits replacing older CPM1A-20CDR-A with modern USB programming
Buying Checklist
- Pick the CP1E-E20DR-A for the cheapest 20-I/O CP1E with AC supply
- Pick the CP1E-E20DT1-D for 24 VDC power and NPN transistor outputs when the panel is 24 VDC throughout
- Pick the CP1E-N20DR-A when Ethernet or RS-485 communications are required — adds built-in 10/100 port and 8K program memory
- Pick the CP1E-E20SDR-A for built-in USB B programming port
- Pick the CP1L-M40DR-A when 40 I/O is needed instead of 20 — same features, more memory, USB programming
- Pick the CP1H-X40DT1-D when high-speed counter or pulse output is needed
Technical Specifications
| Model | CP1E-E20DR-A |
|---|---|
| Series | CP1E-E (basic-model CP1E) |
| Power Supply | 100 to 240 VAC, 50/60 Hz (select 'A' for AC or 'D' for 24 VDC) |
| Operating Voltage Range | 85 to 110 % of rated supply voltage |
| Power Consumption | ≤ 30 VA at 240 VAC |
| Built-in 24 VDC Sensor Supply | 0.3 A max, isolated from internal 24 VDC |
| Total I/O Points | 20 (12 inputs + 8 outputs) |
| Digital Inputs | 12 × 24 VDC, PNP or NPN via COM polarity |
| Input ON Voltage | ≥ 17.0 VDC |
| Input OFF Voltage | ≤ 5.0 VDC |
| Input Response Time | 0 to 32 ms (filter settable, default 8 ms) |
| Digital Outputs | 8 × mechanical relay, SPST-N/O form A |
| Output Rating | 2 A / 250 VAC or 2 A / 24 VDC resistive, 8 A per common |
| Output Mechanical Life | ≥ 20 million operations (no load) |
| Output Electrical Life | 100,000 operations at rated resistive load |
Resources & Downloads
FAQ for CP1E-E20DR-A
What's the difference between CP1E-E20DR-A and CP1E-N20DR-A?
Same 20 I/O and same AC supply, but the N-model has additional capability: 8K-step program memory (vs 2K on E), built-in Ethernet port for Modbus TCP / Host Link (E-model has no Ethernet), built-in RS-232C and RS-485 ports (E-model has USB only), 16-bit analog slider switches on the front panel (E-model has none), and an option board slot for RS-422 / RS-485 expansion.
Can the CP1E-E20DR-A host CP1W expansion units?
Yes — the CP1E-E supports up to 3 CP1W expansion units via the CP1W-CN811 cable (80 mm). For a 20-point CP1E-E20DR-A the I/O table ceiling is 160 points, so you can add 3 × CP1W-40EDR (40 points each) for a total of 140 I/O, or any combination of digital, analog (CP1W-AD042 / DA021), and communication options (CP1W-CIF11 / CIF12-V1 / ME05M) as long as the total stays under 160 points. Configure expansion via CX-Programmer's I/O Table Settings or Sysmac Studio's EtherCAT/Sysmac editor.
How do you program the CP1E-E20DR-A?
Connect a USB cable (Type A to mini-B) between the PC and the CP1E-E20DR-A's mini-B port. Launch CX-Programmer 9.6 (or later), create a new project selecting CP1E as the CPU type, set up the I/O table from the PLC, and you can write/read the ladder program directly. Sysmac Studio 1.0 or later also supports the CP1E (select 'CP1E' as the device family in the controller configuration).
Is the CP1E-E20DR-A discontinued?
No — the CP1E family is current production as of 2025 with no published EOL for the 20-point E variants. However, the direct predecessor CPM1A-20CDR-A was discontinued in 2020 and the CP1E is its supported migration path. For newer designs the CP1L-EM series adds Ethernet and battery-less operation as a higher-spec alternative.
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