Siemens SINUMERIK 840D sl Function Manual page 126

Safety Functions Integrated in the System/Drive
6.3 Safe stops A-F
SGE de-select external STOP E
When a stop request is active, the SGA "STOP E is active" is set.
The MD 36977: $MA_SAFE_EXT_STOP_INPUT[3] defines the selection/de-selec-
tion of the external braking request, in this case "de–select external STOP E" (ex-
tended stopping and retraction plus path braking).
Note
STOP E only produces a different response than STOP D if the user has
configured the ESR function – extended stop and retract – and initiation of the
ESR is programmed depending on $VA_STOPSI or $A_STOPESI.
If ESR is not active, the STOP E behaves like a STOP D. However, if the ESR
configuration is incorrect, there is a delay of up to 2 IPO cycles compared to
STOP D until the braking operation is initiated. Possible causes:
S The initiation of the ESR as static synchronous action does not take into
account the system variables $VA_STOPSI or $A_STOPESI.
S ESR is neither parameterized nor enabled.
S For individual PLC controlled axes, only the axis-specific ESR is used via
$AA_ESR_TRIGGER. This trigger may be used in addition to the
channel-specific trigger.
For other incorrect ESR programming, a delay by the time entered in
$MC_ESR_DELAY_TIME1 and $MC_ESR_DELAY_TIME2 is possible. After these
times have expired, braking is initiated at the current limit. Possible cause:
S The retraction position cannot be reached within the specified time.
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SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 03.2006 Edition
© Siemens AG, 2006. All rights reserved
03.06