Outputs - Siemens Simatic Manual

Fail-safe function blocks for storage and retrieval machines
V_STOP_MONITORING
MAXTOL_V
MAXTOL_POS
SAFE_POS
SAFE_V
EXECUTE
ACK
3.7.2.2

Outputs

Name
SBR_OK
RAMPING
BUSY
POS_THRESHOLD
V_THRESHOLD
ACK_REQ
ERROR
DIAG
S7-Distributed Safety/SIMATIC Safety - fail-safe function blocks for storage and retrieval machines
Shutdown threshold for monitoring [SLU/min]
As soon as the actual velocity falls below this threshold,
Int
the block can be acknowledged after initiating brake
ramp monitoring.
Velocity tolerance [SLU/min]
Int max. permissible value that SAFE_V can exceed the
configured braking ramp
Position tolerance [SLU]
Int max value that SAFE_POS can exceed the position limit
according to the configured braking ramp
Safety actual position [SLU]
is supplied from the F_SAFE_POS block, the signal
source is a direct measuring system, which is read-in via
the standard program.
Int In the block, the velocity is derived from how this value
changes with respect to time. If, after SS1 has been initi-
ated, the block identifies that the axis is not braked along
the configured ramp, then the block provides a 0 signal
at SBR_OK, which can be used to initiate STO.
Safe actual velocity [SLU/mm]
is supplied from the F_SAFE_POS block, the signal
source is the motor encoder, which is ready in via the SI
part of the drive.
Int
If, after SS1 has been initiated, the block identifies that
the axis is not braked along the configured ramp, then
the block provides a 0 signal at SBR_OK, which can be
used to initiate STO.
Start monitoring
The block becomes active with a rising edge at this input;
Bool
i.e. the brake ramp monitoring is started (taking into ac-
count T_DELAY)
Acknowledging
Bool If a fault occurs in normal operation, then this must be
reset using ACK before the system can be restarted.
Data type Description
Status of the brake ramp monitoring
1: Brake ramp is maintained or monitoring is not active.
Bool 0: Drive does not brake as a minimum with the configured
down ramp
STO should be initiated if this output changes to 0.
Status of the braking ramp
Bool
1: The axis is braking
Status of the ramp monitoring
Bool
1: Position and velocity limit monitoring active
Position limit value [SLU]
Int effective limit for ramp monitoring regarding the position
change
Velocity limit tolerance [SLU/min]
Int
effective limit for ramp monitoring regarding the velocity
Acknowledgment request
If a fault has occurred, but is no longer active, and can
Bool
therefore be acknowledged, then this block indicates this
using a 1 signal at ACK_REQ.
Error
This output is set if the block has been incorrectly parame-
terized – or if the block identifies that the SS1 braking ramp
Bool
has been violated in operation. The output remains set until
an error is no longer active and has been acknowledged.
Word Diagnostic word
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