Digital-combi-channels (EPP6224-0522 only)
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Risk of supply voltage feedback If you supply a connected sensor from an external voltage source, this external voltage can be fed back to UP via the digital combi channel (pin 2 or pin 4). This means that UP can continue to be present even when the UP power supply is switched off (e.g. via emergency shutdown). The box module and other devices connected to UP may continue to be supplied with power unnoticed. Injuries and property damage are possible.
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Two digital combi channels are available at each of the M12 sockets X03, X04, X07 and X08. Each digital combi channel can be operated either as a digital input or as a digital output.
Pin assignment
Pin | Symbol | Function |
|---|---|---|
1 | +24 V Up | Sensor power supply: 24 VDC from UP |
2 | In-/Output B | Digital input / digital output |
3 | GNDp | GNDP |
4 | In-/Output A | Digital input / digital output |
5 | ⏚ | Functional earth |
The same earth potential is available at pin 5 that is applied to the functional earth connections of the box module (Functional earth (FE)).
Behavior under short-circuit conditions
- The sensor power supply on pin 1 is short-circuit proof.
If the sensor power supply is short-circuited on one of the connections, the sensor power supply on all four connections is shut down for the duration of the short circuit. - The digital outputs are short-circuit proof.
A short circuit on one of the digital outputs does not affect any other functions of the box module.