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Bosch Rexroth AG
Connection examples for safe inputs
Error type
Input to assigned clock output
Input to non-assigned clock output
Clock output to clock output
Short circuit
Input to ground
Clock output to ground
Fig. 8-12
Two-channel equivalent with cross-circuit monitoring: supply through T1 and T2 [...]
1
SF = safety function
2
Only applies when symmetry monitoring is active.
Parameterization
Input xx channel 1/channel 2
Assignment
Filter time (t
)
Filter
Symmetry
Start inhibit due to symmetry viola-
tion
Cross-circuit monitoring
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IndraControl S20 Module With Safe Digital Inputs S20-PSDI-8/4
Detec-
Diag-
Loss of
1
tion
nostics
SF
Yes
Sym-
No
metry
viola-
2
tion
Yes
Cross-
No
circuit
Yes
Cross-
No
circuit
Yes
Sym-
No
metry
viola-
2
tion
Yes
Short
No
circuit
Typical parameterization
Parameterized as/value range
Two-channel equivalent
3 ms
100 ms
Enabled
Cross-circuit monitoring
DOK-CONTRL-S20*PSDI*8*-AP02-EN-P
Remark
The error is detected on a change in state, as the state only changes
in one channel.
–
Change in state from "1" to "0":
The faulty input remains at "1". A "0" is transmitted in the process
data image of the affected inputs.
–
Change in state from "0" to "1":
A "0" is transmitted in the process data image of the inputs, if the
faulty input was not previously set to state "0".
See
"Cross-circuit" on page
48.
The error is detected for inputs which are assigned to different clock
outputs.
The error is detected in state "1" or on a change in state from "0" to
"1", as the state only changes in one channel.
The error is detected in state "1" or on a change in state from "0" to
"1", as the state only changes in one channel.
The error is also detected as a short circuit of the clock output.
The affected clock output is disabled.
Remark
Application-specific
Application-specific
Application-specific
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