Siemens SIMODRIVE 611 universal Function Manual page 303

08.99
Net data The net data save is realized in both data transfer directions (master
save <––> slave) using a sign–of–life that comprises a 4–bit counter.
The sign–of–life counter is always incremented from 1 to 15, and then
starts again with the value 1.
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SIMODRIVE 611 universal Description of Functions (FBU) – 04.05 Edition
5.8 Motion Control with PROFIBUS–DP (from SW 3.1)
Master sign–of–life
– The control signals STW2.12 to STW2.15 are used as master
sign–of–life.
– The master sign–of–life counter is incremented in each master
application cycle (T
MAPC
– P0879. 2 to .0 Permissible sign–of–life error
– P0879. 8 Operation with/without
Master sign–of–life monitoring
– Monitoring
The master sign–of–life is monitored in the DP slave. If the
master sign–of–life does not consecutively correspond to the
expected value or more often than is permitted in P0879 bit 2 to
bit 0, then the following occurs:
––> fault 597 (PROFIBUS: synchronization error) is output
––> zero is output as slave sign–of–life
––> the status signal ZSW1.9 (control requested/control not pos-
sible) is set to "0"
––> the system re–synchronizes to the master sign–of–life
Slave sign–of–life
– The status signals ZSW2.12 to ZSW2.15 are used as slave
sign–of–life.
– The slave sign–of–life counter is incremented in every DP cycle
(T ).
DP
5 Communications via PROFIBUS DP
).
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