Omron CP1W-8ET — 8-Point NPN Output Expansion
SKU: CP1W-8ETUSD 35.00
CP1W 8-point NPN sink transistor output expansion for CP1L / CP1H / CP1E / NSJ CPUs, 0.3 A per point, 4.5-26.4 VDC, 0.1 ms response.
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Product Overview
The Omron CP1W-8ET is an 8-point NPN (current-sinking) transistor output expansion unit for the CP1W series. It bolts onto the right side of a CP1E / CP1L / CP1H / NSJ CPU via the flat CP1W-CN811 I/O connecting cable, adding 8 fast digital outputs to small cabinets that need a few more outputs than the CPU supplies. Each output switches a 4.5-26.4 VDC load at up to 0.3 A per point, with a 0.1 ms ON / 0.4 ms OFF response. Pick the 8ET when the PLC expects sinking inputs on the load side, the default for CP1E-N___DT-D and CP1L-M___DT-D CPUs.
Where it fits in the CP1W expansion lineup
The CP1W expansion line is split by point count and output type. CP1W-8ET is the 8-point NPN sink transistor output. CP1W-8ET1 is the PNP (current-sourcing) twin. CP1W-16ER is the 16-point relay output for mixed AC and 24 VDC loads. CP1W-20EDT / CP1W-40EDT mix 24 VDC inputs with 16 / 32 transistor outputs in a wider body. Pick the 8ET when you need a small sink-output block to add to an existing CP-series CPU.
Choosing sink (NPN) vs source (PNP)
The CP1W-8ET is NPN sinking output - the transistor pulls the load to 0 V while the load's other terminal goes to the positive DC rail. The CP1W-8ET1 PNP source output does the opposite - it sources the positive rail to the load while the load's other terminal returns to 0 V. Match the expansion to the CPU body - a DT (sink) or DT1 (source) CPU pairs with the same-polarity expansion. Mixing polarities requires careful common-rail wiring.
Before ordering
Confirm the CPU is a CP1E / CP1L / CP1H / NSJ or CPM2A with a free CP1W expansion port. If total load exceeds 1.6 A on the 8ET common, step to a wider 20EDT or 40EDT. Mount on a DIN-rail (TR35-15Fe IEC 60715). Wire the load to the removable M3 terminal block with 0.25 mm stranded wire and a ferrule. Connect the CP1W-CN811 cable, power on, and the 8 output points appear in CX-Programmer automatically.
Key Features
- CP1W series 8-point digital OUTPUT expansion unit
- NPN current-sinking transistor outputs (8ET = sink)
- Each output: 0.3 A max at 4.5-26.4 VDC load
- 1.6 A max per common (8 points shared common)
- 0.1 ms ON / 0.4 ms OFF response time
- 0.1 mA max output leakage
- Removable M3 screw terminal block
- Flat CP1W-CN811 connecting cable (sold separately)
- DIN-rail or panel mount, 90 x 66 x 50 mm body
- Compatible with CP1E / CP1L / CP1H / NSJ / CPM2A PLCs
- SKU: CP1W-8ET
- Series: CP1W digital expansion unit
- Voltage: 4 VDC
- I/O: 8 I/O
Best-Fit Applications
- Adding 8 solenoid outputs to a CP1L-EL20DR-D control cabinet
- Driving small 24 VDC relays from a CP1E-N40DR-A PLC
- Spare outputs for indicator lamps on a labelling machine
- Extra pump or cylinder outputs on a small parts-feeder panel
- Output block on a CP1H-X40DR-A machine retrofitted to a sensor-heavy design
Buying Checklist
- Confirm the CPU is a CP-series (CP1E / CP1L / CP1H / NSJ / CPM2A) with a free CP1W expansion port.
- Choose CP1W-8ET1 for PNP source output to match a DT1 (sourcing) CPU body polarity.
- Choose CP1W-16ER for 16-point relay outputs when the load is mixed AC mains and 24 VDC.
- Choose CP1W-20EDT when both extra inputs and 16 sink outputs are needed in one slot.
- Verify total load current per common stays below 1.6 A before adding more output points.
- Confirm the CP1W-CN811 connecting cable is on hand before installation.
Technical Specifications
| Series | CP1W digital expansion unit |
|---|---|
| Output Points | 8 sinking (NPN) transistor outputs |
| Load Voltage | 4.5 to 26.4 VDC |
| Output Current | 0.3 A per point, 1.6 A per common max |
| Response Time | ON 0.1 ms max / OFF 0.4 ms max |
| Leakage Current | 0.1 mA max |
| Connection | Removable M3 screw terminal block |
| Required Cable | CP1W-CN811 (sold separately, 80 mm right-to-left) |
| Dimensions | 90 x 66 x 50 mm (H x W x D) |
| Mounting | DIN-rail (TR35-15Fe IEC 60715) or M4 panel screws |
| Operating Temperature | 0 to 55 degC |
| Compatible CPUs | CP1E, CP1L, CP1H, NSJ, CPM2A |
Resources & Downloads
FAQ for CP1W-8ET
What is the difference between CP1W-8ET and CP1W-8ET1?
The CP1W-8ET is NPN (current-sinking) output - the transistor pulls the load to 0 V. The CP1W-8ET1 is PNP (current-sourcing) output - the transistor switches the positive rail to the load. Match the polarity to the CPU: a DT (sink) CPU pairs with the 8ET, a DT1 (source) CPU pairs with the 8ET1.
Does the CP1W-8ET need a CP1W-CN811 cable?
Yes. The CP1W-8ET does not bus to the CPU directly. A flat CP1W-CN811 connecting cable (sold separately, 80 mm long) is required to bridge the unit to the CPU or to the previous CP1W expansion module. CX-Programmer is not required to commission the unit - the I/O appears in the CPU's I/O table automatically once the cable is connected.
How many CP1W-8ET units can I mount on one CPU?
Up to 3 CP1W expansion units on a CP1E / CP1L / CP1H CPU, with a ceiling of 15 input words and 15 output words occupied across all CP1W expansions. A CP1L EM40DT1-D can host three 8ET units (24 sink outputs total) within its 160-point budget; a CP1H can host up to seven CP1W expansions but the I/O count ceiling is the same.
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