Product Description:

The 0GH-DI426 is a digital input slice produced by B&R Automation for the 0GH PLC Modules series. It plugs onto BP200, BP201, or BP210 base plates and provides an interface that brings field sensor states into the PLC backplane without additional signal conditioning. By accepting 24 V logic levels and using optocoupler barriers, the board isolates machine wiring from controller electronics so industrial automation systems can record on/off conditions while limiting ground-loop currents.

The module offers 32 input channels, giving a high signal density per slot. Each channel is referenced to a nominal 24 VDC and draws current through a front-end resistance of 4 kΩ; this resistance limits inrush and helps set the permissible sensor drive capability. Transition recognition is fast, and a switching delay of only 1 msec means state changes appear in the PLC scan with minimal latency. Total power consumption remains at 6 W, so cabinet thermal load stays low even when all inputs are energized. Wiring may be configured for sink or source, allowing the same terminal strip to work with PNP or NPN field devices, and both group-to-group and input-to-PLC isolation are achieved with optocouplers, protecting the CPU from external transients.

The input lines are organized into eight groups, each containing four inputs, and the backplane sees these as independently isolated blocks; the count of isolated input groups is 8. Input signals can rise safely to 30 VDC without damaging the circuitry, while the module recognizes a logical high once the voltage exceeds the specified threshold of >15 V. A low is accepted below 5 V, and the full decision band spans the 5 to 15 V threshold range, which helps prevent ambiguous states during slow transitions. Group isolation is present, but the four inputs within the same block share a common reference and do not have same-group isolation.