Omron CJ1W-AD081-V1 — 8-Ch Analog Input, CJ Rack
SKU: CJ1W-AD081-V1USD 115.00
CJ-series 8-channel analog input, 1/8000 resolution, 250 us per point, 1-5 V / 0-10 V / -10 to 10 V / 4-20 mA.
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Product Overview
The Omron CJ1W-AD081-V1 is an 8-channel analog input unit for the CJ-series PLC rack, used with CJ1, CJ1M, CJ2, and NJ-series CPUs that accept CJ1W expansion. Each channel has its own signal range, settable individually from 1-5 V, 0-5 V, 0-10 V, -10 to +10 V, or 4-20 mA, with a resolution of 1/8000 (selectable to 1/4000). Conversion runs at 250 microseconds per point. Voltage channels read to plus or minus 0.2 % of full scale; current channels to plus or minus 0.4 %. The unit fits a standard CJ1W slot, draws 580 mA from the 5 V rack supply, and lands on a detachable 18-point terminal block. It is the right pick for eight or fewer analog field signals on a CJ rack, such as pressure, temperature (with a transmitter), flow, or level.
Why 8 channels instead of 4
The CJ1W-AD041-V1 covers 4 analog inputs at the same 1/8000 resolution, while the CJ1W-AD081-V1 doubles that to 8 channels on the same 31 mm wide slice. For machines that need eight or fewer points, the AD081 saves the second slot and one set of terminal blocks. For higher-speed work, the CJ1W-AD042 offers a 20 microsecond direct conversion, but at 4 channels and a different resolution setting.
Scaling and wiring
Each channel can be scaled in the CPU memory to engineering units (bar, deg C, L/min), and the detachable terminal block makes signal re-wiring fast on commissioning day. For 4-20 mA loops, fit a 250 ohm resistor across the input terminals to convert to 1-5 V if the PLC expects a voltage signal. Use shielded twisted-pair cable and ground the shield at the panel end only.
Before ordering
Confirm the rack has a free slot to the right of the CPU. The AD081-V1 draws 580 mA from the 5 VDC rack supply, so check the CJ1W-PA202 / PA205R rating. For 4-20 mA current loops, decide between wiring the input as current (default) or converting to 1-5 V with an external resistor. Pair with CX-Programmer for scaling and CX-Integrator for the NJ-series equivalent.
Key Features
- 8 analog inputs on a single 31 mm CJ1W slice
- Individual signal range per channel: 1-5 V, 0-5 V, 0-10 V, +/-10 V, 4-20 mA
- 1/8000 resolution (selectable to 1/4000)
- 250 us conversion time per point
- Plus or minus 0.2 % voltage, plus or minus 0.4 % current accuracy
- Disconnect detection, peak hold, and averaging built in
- Detachable 18-point terminal block, 580 mA at 5 VDC
- SKU: CJ1W-AD081-V1
- Series: CJ1W high-function I/O unit
Best-Fit Applications
- Pressure transmitter scan on a hydraulic or pneumatic press
- Tank level reading on a process skid with 4-20 mA level probes
- Flow metering on a water-treatment skid with up to eight flow signals
- Temperature scan with 4-20 mA temperature transmitters on an oven
- Bench-test stands where each channel needs a different signal range
Buying Checklist
- Choose CJ1W-AD081-V1 for 8 channels and 1/8000 resolution on a CJ rack.
- Choose CJ1W-AD041-V1 for 4 channels at the same resolution.
- Choose CJ1W-AD042 for 20 us direct conversion when speed matters most.
- Choose CJ1W-DA041 to send 4 analog outputs back to valves or drives.
- Confirm the rack has a free slot and the PSU can spare 580 mA at 5 VDC.
- Allow for a 250 ohm resistor on each 4-20 mA loop if converting to voltage.
Technical Specifications
| Series | CJ1W high-function I/O unit |
|---|---|
| Function | Analog input, 8 channels |
| Signal Ranges | 1-5 V, 0-5 V, 0-10 V, -10 to +10 V, 4-20 mA (per channel) |
| Resolution | 1/8000 (selectable to 1/4000) |
| Conversion Time | 250 us per point (1 ms / point settable) |
| Accuracy (Voltage) | Plus or minus 0.2 % of full scale |
| Accuracy (Current) | Plus or minus 0.4 % of full scale |
| Functions | Disconnect detection, peak hold, averaging, scaling |
| Connection | Detachable 18-point terminal block (M3 screws) |
| Internal Current Draw | 580 mA max. at 5 VDC |
| Dimensions (W x H x D) | 31 x 90 x 65 mm |
| Compatible CPUs | CJ1, CJ1M, CJ2 (any CJ-series CPU) |
Resources & Downloads
FAQ for CJ1W-AD081-V1
Can the CJ1W-AD081-V1 mix voltage and current inputs?
Yes. Each of the eight channels has its own signal range setting in the CPU memory, so you can run four channels at 4-20 mA and four at 0-10 V on the same module. The wiring differs per channel but the scaling is independent.
What is the difference between CJ1W-AD081-V1 and CJ1W-AD041-V1?
Both are CJ-series analog input modules at the same 1/8000 resolution. The AD081-V1 carries 8 channels on a single 31 mm slice, while the AD041-V1 carries 4. Pick AD081-V1 when you need eight or fewer channels; pick AD041-V1 when four is enough and you want spare CPU capacity for faster conversion.
Does the CJ1W-AD081-V1 work on a CJ2 CPU?
Yes. CJ1W I/O modules are supported on CJ1, CJ1M, CJ2, and NJ-series racks (with CJ1W adapter). The AD081-V1 is registered as a special I/O unit in CX-Programmer or Sysmac Studio, and the scaling is handled in the CPU memory just like any CJ1W slice.
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