Connection Examples for Safe Outputs
DOK-CONTRL-ILPSDO8****-AW04-EN-P
Bosch Rexroth AG
Rexroth Inline Module with Safe Digital Outputs R-IB IL 24 PSDO 8-PAC
Device diagnostics and behavior of the module in the event of an er-
ror
Error type
Detec-
tion
Diag-
nostics
Loss of
SF
Remark
Error in the actuator
Despite being disabled, a switching
element of the two-channel actuator
does not switch to the safe state (e.g., a
contact will not open)
No
None
No
No loss of the safety function as the second switching element of the
two-channel actuator can be disabled.
Detect errors using external monitoring.
Implement a restart inhibit in the event of this error.
Please take into consideration all the possible errors for the actuator
used.
Test the shutdown capability of the actuator at regular intervals.
Actuator cannot be enabled
(e.g., interrupt)
No
None
No
Detect errors using external monitoring. Please take into
consideration all the possible errors for the actuator used.
Ensure that this error does not result in delayed system startup.
Other errors
(depending on the actuator)
Please take into consideration all possible errors that can occur
in the actuator.
Error in the wiring
Interrupt
Cable interrupt between output and
actuator or between actuator and
ground
No
None
No
Detect errors using external monitoring. Please take into
consideration all the possible errors for the actuator used.
Ensure that this error does not result in delayed system startup.
Cross circuit
Output to output
Yes (con-
ditional)
All LEDs
OUT:
Red ON
No
When the outputs are disabled, a cross circuit between the outputs is
only detected if the test pulses are enabled. If an error is detected, the
module disables all its outputs.
If the test pulses have been disabled, test the circuit and the
external wiring at regular intervals by enabling the outputs.
Short circuit
Output to ground
or
output to FE
Yes
Short
circuit or
overload,
OUTx
No
The error is detected in the ON state. The output is disabled (safe
state). The module cannot be switched on again with an edge from “0”
to “1” until the error has been removed and acknowledged.
Fig. 7-8
Two-channel
Unexpected machine startup
An operator acknowledgment leads to a positive edge and can thus result in the
outputs being re-enabled.
WARNING
