User Manual
Appendix A
GFK-2843A
Jan 2020
VersaSafe system
88
Abbreviatio
n
Meaning
Note
t
FWD_OUT
F-Watchdog time (communication) Specified by the user in VersaConf Safety for
each
IC220SDL752/IC220SDL753/IC220SDL840
module.
Without forwarding to a satellite with outputs,
t
FWD_OUT
= 0.
t
OUT
Shutdown time of the output
User manual for the safe output module.
Without forwarding to a satellite with outputs,
t
OUT
= 0.
t
A
Response time of the actuator
Actuator data sheet
t
STOP
Stopping time of the machine
Measurement
t
G
Guaranteed shutdown time
Important
Fluctuations in network communication and in the copy routines (e.g., including
controller STOP) result in safe communication being aborted.
t
FWD
The F-Watchdog time (t
FWD
) is specified for each communication relationship in VersaConf
Safety.
The minimum achievable t
FWD
depends on the network and the controller (see
documentation for the controller used).
Important
When specifying the F-Watchdog time, please remember that it can be affected by future
system expansions.
Within t
FWD
, the standard network and the standard control system must be able to
transmit telegrams from satellites to the IC220SDL963.
t
S
, t
IN
Important
If several sensors are involved in the safety function, the longest response time of the
sensors involved is included in the calculation.
If several inputs are involved in the safety function, the longest processing time of the
inputs involved is included in the calculation.
If several IC220SDL543/IC220SDL544 devices are involved in a safety function, the
longest F-Watchdog time is included in the calculation.
