Activating Autonomous Drive Emergency Retraction In Case Of; Plc Failure Or 5 V Undervoltage (As From Sw 6.3) - Siemens SINUMERIK 840C Installation Instructions Manual

01.99
12.20.8.2 Activating autonomous drive emergency retraction in
case of PLC failure or 5 V undervoltage (as from SW 6.3)
No NCK failure, activation only when in operative mode, no run up in the general reset mode
Activating
Clearing for activation of the autonomous drive emergency retraction is implemented according
to the function via the following MD bits:
NC MD
7 6
Delay of the
NC ready
signal for
1 IPO cycle
5022
in case of
PLC failure
or 5 V
under-
voltage
5022.4=1 Clearing for activation of the autonomous drive emergency retraction in case
of PLC failure
5022.5=1 Clearing for activation of the autonomous drive emergency retraction in case
of 5 V undervoltage
5022.7=1 Delay of the NC ready signal for 1 IPO cycle in case of PLC failure of 5 V
undervoltage
5022.7=0 No delay of the NC ready signal for 1 IPO cycle in case of PLC failure or 5 V
undervoltage
Default setting of bit is 0.
Reactions
Display of the applicable alarm on (POWER ON), stopping the NCK CPU and execution of the
autonomous drive emergency retraction.
After POWER ON, the NCK instantly runs in normal operational mode instead of the then
startup mode.
© Siemens AG 1992 All Rights Reserved
SINUMERIK 840C (IA)
12.20.8 Configuration help for generator operation and emergency retraction
Bit No.
5 4 3
Retraction in
5 V under-
case of PLC
voltage
failure
6FC5197- AA50
12 Functional Descriptions
2 1 0
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