S7-400 I/O Modules; F-Di Signal Filtering - Siemens SINAMICS G120 Function Manual

Frequency inverter
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3.2.3.6

S7-400 I/O modules

There are no fail-safe digital output modules available for the S7-400 controller.
Use S7-300 modules (see the section S7-300 I/O modules (Page 54)) or the distributed I/O
system ET 200S (see the section ET 200S I/O modules (Page 55)).
3.2.4

F-DI signal filtering

The inverter checks the consistency of the fail-safe digital input signals. Consistent signals at
both inputs always assume the same signal state (high or low).
Discrepancy
With electromechanical sensors (e.g. emergency stop buttons or door switches), the two
sensor contacts never switch at exactly the same time and are therefore temporarily
inconsistent (discrepancy). A long-term discrepancy points toward a fault in the wiring of a
fail-safe input, e.g. a wire break.
An adjustable filter in the inverter prevents faults caused by temporary discrepancy. Within
the filter's tolerance time, the inverter suppresses the discrepancy monitoring of the fail-safe
inputs.
Figure 3-17
Table 3- 3
p9650, p9850
Safety Integrated Function Manual, SINAMICS G120
Function Manual, 07/2010, FW 4.3.2, A5E03052391B AA
Filter for suppressing discrepancy monitoring
Parameters for the discrepancy monitoring tolerance time
Basic Safety
Activation via F-DI
p10002, p10102
3.2 Activation via F-DI
Extended Safety
Activation both via F-DI and
PROFIsafe
p9650, p9850
Activation
57

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