Description Of Stop F - Siemens SINUMERIK 840D sl Function Manual

05.08
6.3.7

Description of STOP F

The STOP F response is permanently assigned to the error handling (e.g. the
crosswise result and data comparison, detecting communication and encoder
faults).
If such as fault/error state is detected, then the following responses are triggered.
Response, if no safety functions are active:
Faults/errors are also detected if none of the safety–related functions are active
(safety functions are SBH, SG, SE, SN). The saved message "defect in a monitor-
ing channel" is output on both the drive and control sides and can only be acknowl-
edged using the NC–RESET key. The message does not interrupt machining.
A system restart is prevented by an internal NC start/traversing inhibit function.
Faults/errors are detected in the drive and control systems.
Response if one safety function is active:
Faults/errors are detected and a STOP B/A response is initiated in the drive and
control system (see description of STOP B). The error can only be acknowledged
from the drive and control using a power on.
Exception: If an internal STOP C/D/E is already present, because STOP F has a
lower priority (see Chapter 6.3.1, Section "Priority of the stop responses").
S Alarm message:
Alarms 27001 "defect in a monitoring channel" and C01711 "SI motion defect in
a monitoring channel" are displayed.
For further diagnostics, for Alarm 27001, a fine error coding is displayed in the
alarm line. The fine coding for the drive alarm can be found in r9725 "SI motion
diagnostics for STOP F".
The significance of the error code is provided in Chapter10.2 under Alarm
27001 "Defect in a monitoring channel".
A delay time before STOP B is initiated can be parameterized using MD 36955
$MA_SAFE_STOP_SWITCH_TIME_F. During this time, the machine manufac-
turer can initiate an NC controlled response, e.g. ESR. After this time has expired,
the involved axis is braked with STOP B. This is also true if, in the meantime, a
stop with a higher priority than STOP F (STOP E, D, C) is present. The system
variables $VA_XFAULTSI and $A_XFAULTSI, bit 1 can be used to detect whether
a STOP F was initiated that is then followed by a STOP B. In the delay time up to
the STOP B, an ESR or braking along the programmed path can be initiated (e.g.
by writing to $AC_ESR_TRIGGER or initiating an external STOP D).
During the delay time up to initiating STOP B, additional, non–safety–related moni-
toring functions can already result in other braking responses. A STOP D or the
initiation of ESR can be influenced due to harder braking responses of the drive
(the same as e.g. the configured braking response when an encoder fails).
© Siemens AG 2008 All Rights Reserved
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 05.2008 Edition
Safety Functions Integrated in the System/Drive
6.3 Safe Stops A–F
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