Bosch Rexroth IndraControl S20-PSDI-8/4 Application Description page 63

DOK-CONTRL-S20*PSDI*8*-AP02-EN-P
IndraControl S20 Module With Safe Digital Inputs S20-PSDI-8/4
Error type
Short circuit
Input to external 24 V
Input to ground
Clock output to external 24 V
Clock output to ground
External 24 V to ground
Fig. 8-24 Two-channel non-equivalent without cross-circuit monitoring: supply through a clock output or external supply
1
SF = safety function
2
Only applies when symmetry monitoring is active.
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Detec- Diag- Loss of
1
tion nostics SF
Yes Sym- No
metry
viola-
2
tion
Yes Sym- No
metry
viola-
2
tion
No None No
Yes Short No
circuit
Yes Sym- No
metry
viola-
2
tion
DANGER
An accumulation of errors can result in the loss of the safety function.
Test the safety function at suitable intervals to detect errors at an early stage.
Bosch Rexroth AG
Connection examples for safe inputs
Remark
The error is detected on a change in state at the latest, 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 not detected.
The error is detected as a change in state from "1" to "0".
The error is also detected as a short circuit of the clock output.
The affected clock output is disabled.
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.
Loss of safety function
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