OMRON CJ1W‑AD041‑V1 4‑Channel Analog Input Unit for CJ Series PLC
The OMRON CJ1W‑AD041‑V1 is a high‑precision analog input module designed for the CJ1, CJ2, and CS1 series PLCs. It provides four isolated inputs, each software‑selectable for voltage (0‑10 V, 0‑5 V, 1‑5 V) or current (4‑20 mA). With 12‑bit resolution and fast conversion time of 1 ms per channel (4 ms for all channels), this module is suitable for high‑speed process control and dynamic signal acquisition.
Input Specifications
Voltage inputs: impedance 1 MΩ, range ±0.5% accuracy. Current inputs: impedance 250 Ω. The module supports two input type groups (channels 1‑2 and 3‑4) independently set via DIP switches or CX‑Integrator software. Resolution: 12 bits (0‑4095) or 0‑4000 BCD selectable. The analog data is stored in dedicated CIO (Common I/O) words, starting at CIO 2000 + (10 × unit number). The unit number is set by a rotary switch on the front panel (0‑F).
Special Features
The CJ1W‑AD041‑V1 includes averaging processing (2 to 64 samples) to smooth noisy signals. Three input filters (low‑pass) with cutoff frequencies of 1 Hz, 10 Hz, or 100 Hz are programmable. Peak and valley hold functions capture extreme values. The module also has a disconnection detection function for 4‑20 mA loops (open sensor detection). All configuration parameters are stored in EEPROM on the module.
Isolation and Accuracy
Each channel is isolated from the others and from the internal PLC bus (isolation voltage: 500 V AC for 1 minute). The overall accuracy is ±0.3% of full scale at 25 °C, with a maximum temperature drift of ±0.01% per °C. The module has a built‑in reference voltage self‑calibration routine that runs automatically every 5 minutes or on command via a bit in the output word.
Installation and Wiring
Dimensions: 31 × 90 × 85 mm (W × H × D). Weight 120 g. The module fits any CJ series slot (no restrictions). Wiring uses a removable 18‑point terminal block (screw type, 0.2‑2.5 mm²). Shielded cable is recommended; the shield should be connected to the ground terminal on the module. The module draws 0.13 A at 5 V DC from the backplane.
Programming Example
In CX‑Programmer, read the analog value from CIO word, for example D0 = 2000 + (10 * unit number) + channel offset. Then use scaling instruction SCL to convert raw data (0‑4095) to engineering units. The module also provides status words for overrange/underrange and disconnection flags.
Applications
Typical use in plastic injection moulding (nozzle pressure), semiconductor wet bench (chemical concentration), and metal forming (hydraulic pressure). Four channels are sufficient for most small to medium process loops.
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