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Bosch Rexroth AG
Connection examples for safe inputs
8.4.1
Notes on errors
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IndraControl S20 Module With Safe Digital Inputs S20-PSDI-8/4
Please observe the following notes on cross-circuit and symmetry violation:
Cross-circuit
The cross-circuit error results in the transmission of the safe state in the process
data image of the affected inputs.
•
Remove the error and then acknowledge the message.
Acknowledging the diagnostic message deletes the message and activates the in-
put. The states at the input are detected immediately.
•
In the safe application program, make sure that the system cannot be restarted
unintentionally after acknowledging the diagnostic message.
•
Observe the maximum failure detection time of 64 ms.
Exceptions in the failure detection time are indicated in the tables below.
If a "1" signal is present at the input and an error occurs, a maximum of 64 ms
elapses until the error is detected. During this time, another "1" can be transmitted,
even in the event of an error.
During the failure detection time, the error can cause the state to change unexpect-
edly from "0" to "1".
•
Make sure that the system cannot be restarted unintentionally as a result of
this change in state.
Symmetry violation
•
The symmetry violation diagnostic message is only displayed if it was not dis-
abled during parameterization of the affected input.
•
Start inhibit due to symmetry violation disabled:
The symmetry violation message does not result in the transmission of the
safe state: see
"Symmetry/ start inhibit" on page
The message must be acknowledged. However, the current status of the in-
puts is always displayed in the process data image of the inputs.
•
Start inhibit due to symmetry violation enabled:
The symmetry violation message results in the transmission of the safe state:
see
"Symmetry/ start inhibit" on page
The message must be acknowledged. The current status of the inputs is dis-
played in the process data image of the inputs.
•
The message can be used to monitor the wear of the safety switch.
DOK-CONTRL-S20*PSDI*8*-AP02-EN-P
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