3 - 8
Power supply
3.3.1. Emergency Off installation for the outputs
Due to the separate power supply of the outputs, these can be
deactivated via a shared emergency off installation.
The advantage is that the system is still supplied with power,
the inputs read and communication (with terminal, PC...) con-
tinued.
However, you must make sure of the following:
There must never be a backward power feed to the outputs while
the output power supply is switched off (e.g. by emergency off
installation)!
This is valid in cases where the system is still supplied with
power.
Wrong:
Outputs set by the program can be supplied via the protective
diode of a back-fed output (in this case: via the test switch),
thus rendering the emergency off function for these outputs in-
effective. Also, the protective diode of the feeding output may
be destroyed if exposed to high loads.
power 24 V DC
emergency-off
switch open
output module
output x
output y
control
signal
activated
control
signal
test switch
closed
power supply 0V
Summary of Contents for KUAX 680C
Page 10: ...Contents 8 Table of contents...
Page 12: ...1 2 Introduction...
Page 90: ...4 36 Description of the commands...
Page 99: ...4 45 Software 4 7 10 Module hierarchy example for different module calls...
Page 102: ...5 2 Networking...
Page 132: ...6 30 Examples...
Page 160: ...A 4 Appendix...
Page 164: ...C 2 Appendix...
Page 180: ...Index 6 Index...