Siemens SINAMICS G220 - Page 696

Description of function
The converter monitors at the two input terminals of the F-DI whether the input signals attain
the same logical signal state within the discrepancy time. With electromechanical sensors, e.g.
EMERGENCY STOP buttons or position switches, the two sensor contacts never switch at exactly
the same time. The input signals of the F-DI are inconsistent (discrepancy).
During the discrepancy time, the converter tolerates inconsistent input signals. The
discrepancy time does not extend the converter response time.
A permanent discrepancy signi󹪝es an error in the F-DI interconnection. In this case, the
converter responds with a safety message
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Figure14-241 Permanent discrepancy
The following 󹪝gure explains the limits for a meaningful setting of p10002 (F-DI switchover
discrepancy time):
• To prevent the converter from responding to a discrepancy, p10002 must be greater than the
discrepancy time T
D
on the F-DI.
• In order to detect even temporary signal changes at the F-DI, p10002 must be less than the
smallest expected switching interval T
S
.


U


U
5
%
5
%
T
S
Switching interval
T
D
Discrepancy time
Figure14-242 Discrepancy time when a relay is switched
Parameters
The following list contains the parameters of the "Discrepancy time for F-DI" function.
Number Name Unit
p10002 SI F-DI changeover discrepancy time [ms]
Functions
14.12Safety Integrated
SINAMICS G220 converter
694 Operating Instructions, 04/2024, FW V6.2, A5E51781573B AB