Omron CJ1W-F159 Plug-In Weighing Module for CJ-Series PLCs

The Omron CJ1W-F159 is a dedicated plug-in weight module manufactured by UNIPULSE. It is designed specifically for the Omron SYSMAC CJ1/CJ2 series PLCs, turning the programmable controller into a high-performance weighing terminal without separate external hardware.

Key Specifications

• Model: CJ1W-F159

• Type: Special I/O Unit (Weighing Module)

• Load Cell Inputs: 4 (350 ohm load cells, parallel connection)

• A/D Conversion Speed: 500 samples/second

• Internal Resolution: 1/40,000

• Input Sensitivity: 0.5 µV/d minimum

• Temperature Coefficient: Zero: ±0.2 µV/°C, Span: ±15 ppm/°C

• Non-Linearity: 0.005% of full scale

• Excitaton Voltage: 5 VDC (60 mA max)

• Current Consumption: 300 mA @ 5 VDC (1 load cell) to 700 mA @ 5 VDC (4 load cells)

• Status Indicators: Front panel LEDs

• Operating Temperature: 0°C to 55°C

• Dimensions: 31 × 90 × 65 mm (W × H × D)

• Storage Temperature: -20°C to 75°C

High-Speed and High-Resolution Weighing

The CJ1W-F159 offers a replacement for standard analog input modules by handling strain gauge (load cell) signals directly. It provides high-speed A/D conversion (500 times/second) and 1/40,000 display resolution, allowing accurate measurement of rapid weight changes.

Functionality and Applications

The module can excite up to four (4) 350 ohm load cells. Applications include hopper scales, bag filling systems, packing scales, and rotary filling systems. The F159 interfaces directly with the CJ1 bus, sending net, gross, and tare weight data via dedicated memory registers.

Configuration and Calibration

Configuration is performed via the PLC's DM (Data Memory) area. Calibration can be performed using actual weights via PLC ladder logic or using a digital smart loader device.

Conclusion

The Omron CJ1W-F159 is an essential component for advanced process control in food, pharmaceutical, and chemical industries.