Rack
3.1 Rack UR6021 (6DD1682-0CH3)
SIMATIC TDC hardware
44 System Manual, 08/2017, A5E01114865-AL
Voltage monitoring
Input voltage
The input voltage is monitored for low level.
Undervoltage < approx. 85 V
signal and CPU STOP, shutdown of
Voltage dips ≤ 20 ms are buffered.
The power supply unit and therefore the system are restarted automatically on recovery from
a voltage dip below the permissible mains voltage.
The power on/off sequence (e.g. generation of a RESET or SYSFAIL signal) corresponds to
the reaction to manual operation of the mains switch.
All output voltages are monitored (e.g. for overload/short-circuit).
Voltage monitoring functions at the power supply
outlet
+5 V in the range from 4.75 V to 5.35 V “POWER OK” LED is lit green;
+ 3.3 V in the range from +3.18 V to +3.5 V
+ 12 V in the range from +11 V to +13 V
- 12 V in the range from -11 V to -13 V
In all other cases, the “POWER OK” LED is lit red.
Select the "Object properties" in the "STOP" tab of
to configure the response of
the relevant module to a system failure alarm (bus signal *
=low):
● The other modules also change to STOP
● The other modules remain in RUN
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