Computer Drive Installation Instructions

01.99 12 Functional Descriptions
12.20.8 Configuration help for generator operation and emergency retraction
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:
5022
Delay of the
NC ready
signal for
1 IPO cycle
in case of
PLC failure
or 5 V
under-
voltage
5 V under-
voltage
Retraction in
case of PLC
failure
NC MD
Bit No.
76543210
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 6FC5197- AA50 12–231
SINUMERIK 840C (IA)