Connection Examples for Safe Outputs
46
Bosch Rexroth AG
DOK-CONTRL-ILPSDO8****-AW04-EN-P
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
Enable the test pulses to improve device diagnostics.
If the test pulses for the actuator are faulty, they can be disabled. In
this case, test the switching capability of the outputs at regular inter-
vals.
Error type
Detec-
tion
Diag-
nostics
Loss of
SF
Remark
Error in the actuator
Despite being disabled, the actuator
does not switch to the safe state (e.g., a
contact will not open)
No
None
Yes
Detect errors using external monitoring. Please take into
consideration all the possible errors for the actuator used.
Test the shutdown capability of the actuator at regular intervals.
If necessary, use a two-channel actuator.
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
All LEDs
OUT:
Red ON
Yes
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.
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. 7-6
Single-channel: Test pulses enabled
Unexpected machine startup
An operator acknowledgment leads to a positive edge and can thus result in the
outputs being re-enabled.
WARNING
