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Bosch Rexroth AG
Connection examples for safe inputs
Sensor
Sensor supply
Achievable SIL/SILCL/Cat./PL
Error type
Error in the sensor
A contact fails to open.
A contact fails to close.
Other errors
(depending on the sensor)
Error in the wiring
Interrupt
Input (cable interrupt between clock
output and sensor or between sensor
and input)
Cross-circuit
Input to input
Input to clock output
Clock output to clock output
Fig. 8-24
Two-channel non-equivalent without cross-circuit monitoring: supply through a clock output or external supply
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IndraControl S20 Module With Safe Digital Inputs S20-PSDI-8/4
S1
IN1_Ch1
IN1_Ch2
S2
+24 V
Fig. 8-23
Two-channel non-equivalent assignment of inputs,
external supply
Basic specifications
Two-channel non-equivalent
Internally through clock output T1 (or T2) (clocking disabled) or externally
SIL 3/SILCL 3/Cat. 3/PL d
Observe the information to understand the change in state: see
ample of correct and incorrect signal change" on page
Device diagnostics and behavior of the module in the event of an
error
Detec-
Diag-
Loss of
1
tion
nostics
SF
Yes
Sym-
No
metry
viola-
2
tion
Yes
Sym-
No
metry
viola-
2
tion
Yes
Sym-
No
metry
viola-
2
tion
Yes
Sym-
No
metry
viola-
2
tion
No
None
No
DOK-CONTRL-S20*PSDI*8*-AP02-EN-P
S1, S2
Two switching elements
+24 V
Supply through external 24 V
Remark
The error is detected, as the state only changes in one channel.
Please take into consideration errors that can occur in the sensor.
The error is detected on a change in state at the latest, as the state
only changes in one channel.
The error is detected, as the state only changes in one channel.
The error is detected, 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.
The error is not detected.
"Ex-
56.
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