What Is SCADA? Supervisory Control Without Replacing the PLC
SCADA sits above PLCs and RTUs: it acquires field data, alarms operators, and issues supervisory commands across plants and remote assets—without replacing local deterministic control.

Integrated processing of high-density digital inputs is streamlined using the Omron CJ1W-ID233, a dedicated 32-point digital input module engineered for the Sysmac CJ1 PLC architecture. This unit receives 24 VDC field signals from industrial proximity sensors, photoeyes, and limit switches. To support high-density signal distribution within a compact footprint, the module utilizes a MIL connector system that simplifies control cabinet wire routing and reduces installation labor when compared to standard screw-terminal blocks.
The internal circuitry utilizes optocouplers to isolate the field-side electrical signals from the sensitive backplane logic, safeguarding the CPU against external electrical surges. Designed for high versatility, the input commons can be wired for either sourcing or sinking input configurations, enabling integration into diverse control architectures.
| Manufacturer | Omron |
| Model/Part Number | CJ1W-ID233 |
| Series | Sysmac CJ1 Series |
| Input Points | 32 points |
| Rated Input Voltage | 24 VDC |
| Rated Input Voltage Range | 20.4 VDC to 26.4 VDC |
| Input Impedance | 5.6 kOhm |
| Input Current | 4.1 mA typical (at 24 VDC) |
| ON Voltage / ON Current | 19.0 VDC minimum / 3 mA minimum |
| OFF Voltage / OFF Current | 5.0 VDC maximum / 1 mA maximum |
| ON/OFF Response Time | 8.0 ms maximum (adjustable from 0 ms to 32 ms in CPU setup) |
| Number of Circuits | 2 circuits (16 points per common) |
| Simultaneously ON Points | 75% (12 points per common) simultaneously ON at 24 VDC |
| Insulation Resistance | 20 MOhm minimum between external terminals and GR terminal (at 100 VDC) |
| Dielectric Strength | 1,000 VAC between external terminals and GR terminal for 1 minute (leakage current 10 mA maximum) |
| Internal Current Consumption | 200 mA maximum (at 5 VDC from PLC backplane) |
| Weight | 70 g maximum |
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| Country of origin |
Japan
|