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

Omron CJ1W-MAD42 mixed analog I/O unit — front view showing the 18-position removable M3 screw terminal block with input terminals (V/I+ / V/I-) for 4 channels and output terminals (V/I+ / V/I-) for 2 channels, plus the 24 VDC external supply terminal

Omron CJ1W-MAD42 — Mixed Analog I/O Unit, 4 In / 2 Out

SKU: CJ1W-MAD42

USD 215.00

CJ-series mixed analog I/O unit with 4 differential inputs and 2 outputs, per-channel configurable ranges (-10 to +10 V, 0-5/10 V, 1-5 V

1-Year Warranty Full manufacturer warranty
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Product Overview

The Omron CJ1W-MAD42 is Omron's CJ-series mixed analog I/O unit, combining 4 differential analog inputs and 2 analog outputs in a single 31 mm wide slot. manufactured by Omron Corporation. Hengyixin Automation stocks this controller in Xiamen and ships within 3-5 business days to most Asian, European, and North American ports.

It is the workhorse unit for process-control loops on packaging machines, HVAC skids, water-treatment skids, and any application where the PLC reads a 4-20 mA signal from a transmitter (pressure, flow, temperature, level) and writes a 4-20 mA or 0-10 V output to a valve positioner, VFD speed reference, or damper actuator. The CJ1W-MAD42 has two resolution settings: 1/4,000 default (1 ms/point conversion speed) and 1/8,000 high-resolution (250 µs/point conversion speed).

The PLC program reads the scaled engineering-unit value directly.

Key Features

  • Conversion speed: 1 ms/point default, settable to 250 µs/point
  • Input signal ranges: -10 to +10 V, 0 to 5 V, 0 to 10 V, 1 to 5.
  • Output signal ranges: -10 to +10 V, 0 to 5 V, 0 to 10 V, 1 to 5.
  • 2 analog outputs
  • SKU: CJ1W-MAD42
  • Series: CJ1W Special I/O Units (CJ-series analog I/O)

Best-Fit Applications

  • Pressure control loop on a boiler — 4-20 mA pressure transmitter on input 0, PID loop in CJ2M CPU, 4-20.
  • Flow control loop on a water-treatment skid — 4-20 mA magnetic flow meter on input 1, PID loop with the.
  • Tank level control on a chemical batching system — 4-20 mA hydrostatic level transmitter on input 2, 4-20 mA output.

Buying Checklist

  • Pick CJ1W-AD081-V1 — for higher-density input, higher resolution
  • Pick CJ1W-AD042 — for input-only applications, slightly lower cost
  • Pick CJ1W-DA041 — for output-only applications, slightly lower cost

Technical Specifications

Model CJ1W-MAD42
Series CJ1W Special I/O Units (CJ-series analog I/O)
Type Mixed analog I/O unit (4 inputs + 2 outputs)
Analog Inputs 4 differential inputs
Analog Outputs 2 outputs
Input Signal Ranges -10 to +10 V, 0 to 5 V, 0 to 10 V, 1 to 5 V, 4 to 20 mA (per-channel configurable)
Output Signal Ranges -10 to +10 V, 0 to 5 V, 0 to 10 V, 1 to 5 V, 4 to 20 mA (per-channel configurable)
Resolution (default) 1/4,000 (12-bit equivalent)
Resolution (high-resolution mode) 1/8,000 (13-bit equivalent)
Accuracy (Voltage) ±0.2% of F.S. (at 23 ± 2 °C, 55 ± 10 % RH)
Accuracy (Current) ±0.4% of F.S. (at 23 ± 2 °C, 55 ± 10 % RH)
Input Impedance (Voltage) 1 MΩ min
Input Impedance (Current) 250 Ω
Voltage Output Max Current 5 mA (max load 2 kΩ)
Current Output Max Load 600 Ω (at 24 VDC supply, sourced through output transistor)

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-MAD42

What's the difference between CJ1W-MAD42 and CJ1W-AD042 or CJ1W-DA041?
The CJ1W-MAD42 is a mixed analog I/O unit that combines 4 analog inputs and 2 analog outputs in one slot. The CJ1W-AD042 is an input-only unit with 4 analog inputs (no outputs, no output channel). The CJ1W-DA041 is an output-only unit with 2 analog outputs (no inputs). For applications with both inputs and outputs, the MAD42 saves DIN-rail space and cost compared to having both an AD042 and a DA041. For input-only applications, the AD042 is slightly cheaper.
How does the input disconnection detection work on the CJ1W-MAD42?
The CJ1W-MAD42 monitors each input on the 1-5 V and 4-20 mA ranges and detects when the input signal drops below the live-zero threshold (0.3 V for 1-5 V, 1.2 mA for 4-20 mA). When this happens, the unit sets a per-input disconnection flag in the allocated I/O memory (the PLC program reads this flag and raises an alarm).
Can I configure different input ranges on different channels of the CJ1W-MAD42?
Yes — each of the 4 inputs is independently configurable for any of the 5 supported ranges (-10 to +10 V, 0 to 5 V, 0 to 10 V, 1 to 5 V, 4 to 20 mA). Likewise, each of the 2 outputs is independently configurable. The configuration is done in the CJ CPU's I/O memory using the allocated I/O words for the unit.
What's the difference between 1/4,000 and 1/8,000 resolution modes?
The 1/4,000 default mode provides 4,000 discrete values across the full input range (e.g., 0-4000 for 0-10 V, or 0-4000 for 4-20 mA). This is equivalent to 12-bit resolution (4096 = 2^12). The 1/8,000 high-resolution mode provides 8,000 discrete values across the full input range, equivalent to 13-bit resolution (8192 = 2^13). The 1/8,000 mode discriminates finer signals (e.g., 0-10000 PSI would resolve to 1.25 PSI steps vs 2.5 PSI steps at 1/4,000).

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