System Description
Kendrion Kuhnke Automation GmbH
24
17 May. 21
Spring-assisted connector with I/O module unlock button
Two-row push-In connector with unlock button
NOTE
Externally turning off the I/O power supply (L+) can be used to trip all outputs.
In that case, LED Power indicates that no voltage is being supplied.
Mind, though, that not all modules have a voltage watchdog to indicate the state to the control
unit.
To have your control program check whether power is supplied to the IOs, connect L+ to a digital
input and poll that input as an indirect indicator of the IO power supply.
Remember the following if you choose to do so:
NOTE
Avoid any reverse feeding of outputs while the power supply to the outputs is turned off.
This applies if the system is still supplied with power.
Outputs enabled by the user program may be supplied power via the protective diode of a reversely
fed output, thus overriding the switch-off function of these outputs. Moreover, the protective diode of
the feeding outputs may yield under high loads and be destroyed.
