Cross-Circuit Monitoring Disabled, Supply Through A Clock Output Or External Supply - Bosch Rexroth IndraControl S20-PSDI-8/4 Application Description

DOK-CONTRL-S20*PSDI*8*-AP02-EN-P
IndraControl S20 Module With Safe Digital Inputs S20-PSDI-8/4
8.4.3 Cross-circuit monitoring disabled, supply through a clock output
or external supply
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)
Fig. 8-15 Two-channel equivalent, cross-circuit monitoring disabled: supply through a clock output or external supply
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S1
IN1_Ch1
S2
IN1_Ch2
T1 (T2)
Fig. 8-13 Two-channel equivalent assignment of inputs,
supply through T1 (or T2), cross-circuit monitoring disabled
S1
IN1_Ch1
S2
IN1_Ch2
+24 V
Fig. 8-14 Two-channel equivalent assignment of inputs,
external supply, cross-circuit monitoring disabled
Basic specifications
Two-channel equivalent
Internally through clock output T1 (or T2) 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 er-
ror
Detec- Diag- Loss of
1
tion nostics SF
Yes Sym- No
metry
viola-
2
tion
Yes Sym- No
metry
viola-
2
tion
Bosch Rexroth AG
Connection examples for safe inputs
S1, S2 Two switching elements
T1 (T2) Supply through T1 or T2
S1, S2 Two switching elements
+24 V External supply
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 affected inputs,
as the faulty input was not previously set to state "0".
On a change in state from "0" to "1", a "0" is transmitted in the process
data image of the affected inputs, as only one channel reports this
change in state.
Please take into consideration all errors that can occur in the sensor.
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"Ex-
47.