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Part of the Omron CJ-Series PLCs series — see the full model table, lifecycle status and replacement parts.

Omron CJ1W-DA08C — front face of the 31 x 90 mm module showing the row of eight green output LEDs, the red RUN LED, the model label CJ1W-DA08C and the row of channel number markings above the LEDs

Omron CJ1W-DA08C — 8-Channel 4-20 mA Analog Output

SKU: CJ1W-DA08C

USD 178.00

Omron CJ1W-DA08C CJ-series Special I/O Unit, eight 4-20 mA current outputs, 12-bit, 1 ms per point, screw terminal.

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Product Overview

The Omron CJ1W-DA08C is an 8-channel 4-20 mA analog output unit for the CJ-series Special I/O Bus, manufactured by Omron Corporation. Hengyixin Automation stocks this I/O expansion unit in Xiamen and ships within 3-5 business days to most Asian, European, and North American ports. Specifications on this page were checked against Omron's CJ-series Analog I/O Unit documentation.

The module converts 16-bit values from the CPU into eight independent 4 to 20 mA current-loop signals. Resolution is 12-bit (4,000 counts), settable to 8,000 with conversion dropping to 250 microseconds per point. Accuracy is +/-0.3% of full scale at 25 degC. Each output drives up to 600 ohm of loop resistance.

The unit slots into any CJ-series CPU or Expansion Rack and takes one Special I/O unit number. Power is 140 mA from the backplane at 5 V plus an external 24 VDC supply at 170 mA for the output loops. For voltage outputs on the same CJ bus, pick the CJ1W-DA08V. For four mixed-range channels, pick the CJ1W-DA041.

Key Features

  • 8-channel 4-20 mA analog output unit for the CJ-series Special I/O Bus
  • 12-bit resolution (4,000 counts), settable to 8,000 / 250 us for high-speed loops
  • Configurable output hold on CPU stop: CLR / HOLD / MAX
  • Built-in scaling (+/-32,000 user units), removable M3 terminal block
  • SKU: CJ1W-DA08C
  • Series: Omron CJ-series Special I/O Unit

Best-Fit Applications

  • Sending speed reference commands to eight VFDs on a textile-stenter line where each channel holds its last value through a CPU stop
  • Driving proportional control valves on a water-treatment skid where the 4-20 mA loops survive 300 m cable runs to the field
  • Replacing a four-channel DA041 panel where two extra current outputs are needed for damper actuators and a chart recorder on the same CJ bus

Buying Checklist

  • Pick the CJ1W-DA08C for an 8-channel 4-20 mA analog output unit on the CJ-series Special I/O Bus.
  • Pick the CJ1W-DA08V instead when the field devices need voltage (0-10 V or +/-10 V) instead of current-loop signals.
  • Pick the CJ1W-DA041 instead when you only need four analog outputs with mixed current and voltage ranges on the same CJ bus.

Technical Specifications

Manufacturer Omron Corporation (Japan)
Series Omron CJ-series Special I/O Unit
Model / SKU CJ1W-DA08C
Function Analog current output unit, 8 channels
Output Signal Range 4 to 20 mA per channel
Resolution 12-bit (1/4,000) or 1/8,000
Conversion Time 1 ms / point (250 us / point at 8,000)
Accuracy +/-0.3% F.S. at 25 degC; +/-0.6% F.S. at 0-55 degC
Max Load 600 ohm per channel
Output Hold CLR / HOLD / MAX, configurable per channel
Current Draw 140 mA at 5 VDC from backplane; 170 mA at 24 VDC external
Terminal / Dimensions / Weight Removable M3 screw block; 31 x 90 x 89 mm per the Omron CJ1W family datasheet; per-model sources give 65-66.5 mm body depth - verify against panel depth before ordering

Manufacturer documentation

Omron's own product page, where the manufacturer's current specification and lifecycle information are published. We are an independent distributor and cannot mirror those documents; the link goes to Omron's site.

FAQ for CJ1W-DA08C

What is the Omron CJ1W-DA08C used for?
It sends eight independent 4-20 mA current signals from a CJ-series CPU to variable-frequency drives, control valves, chart recorders and I/P transducers. The unit sits on the CJ I/O Bus as a Special I/O Unit and updates all eight channels each PLC cycle.
CJ1W-DA08C vs CJ1W-DA08V — what is the difference?
Output type. The DA08C is current-only (4-20 mA) and drives up to 600 ohm per channel. The DA08V is voltage-only (0-10 V or +/-10 V). Both are 8-channel Special I/O Units on the same CJ bus slot.
How many CJ1W-DA08C units can sit on one CJ rack?
Up to 7 with a CJ2H-CPU6_ CPU and 8 with a CJ1W-PA205R or CJ1W-PD025 power supply, depending on the rest of the rack's current draw. Each unit takes one Special I/O unit number.
What happens to the outputs if the CPU stops?
By default the module holds the last value, but each channel can be set to CLR (0 mA), HOLD (last value) or MAX (full scale) via the CX-Programmer output-hold setting. The choice is per channel.
Does the CJ1W-DA08C need an external 24 V supply?
Yes. The output loops need an external 24 VDC supply rated at 170 mA in addition to the 140 mA the unit draws from the CJ backplane at 5 V.

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