Sld Simolink Delta Evaluation - Siemens FM 458-1 DP Manual

5.3

SLD SIMOLINK delta evaluation

Symbol
Hardware address SLB ―GV
Brief description
Mode of operation
I/O
TAD SLB hardware address (name of the SLB module), which can be
configured in HWConfig
Delta time
DT
Difference to the last SIMOLINK cycle duration
Delta time, max.
DMX
Maximum value of DT
DMN Delta time, min.
Minimum value of DT
SEQ Sequence number
Number of the block in the SIMOLINK block sequence
This value provides information as to whether the block was correctly
initialized.
YF Error status of the block
YF=0 no error, YF > 0 refer to coded error output @SL
Group error bit
QF
QF=0 no error, QF=1 for error (if YF≠0)
Configuringdata
Function Blocks - FM 458-1 DP
Edition 12.2004
SLD
TAD
A sampling time failure can be detected using function block SLD. The
counter status is interrogated at each SYNC interrupt (this is generated at
the end of every telegram cycle). The block can calculate and output the
difference to the old (previous) value.
The blocks reads the interrogated value of the counter and generates the
difference to the value which was saved in the old (previous) cycle. This
value is output at DT.
The minimum and maximum values of DT are kept for monitoring
purposes.
Computation time [µs]
Can be inserted online
Can be configured in
Executed in
Special features
SIMOLINK drive coupling
DAT DI ― Delta time
DMX DI ― Delta time, max.
DMN DI ― Delta time, min.
SEQ I ― Sequence number
YF I ― Block error status
QF BO ― Group error bit
FM 458-1 DP 19,8
No
Interrupt tasks
Cyclic tasks
Initialization mode
Normal mode
-
(default: 0)
(default: 0)
(default: 0)
(default: 0)
(default: 0)
(default: 0)
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