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PSR-TRISAFE-S
2-8
PHOENIX CONTACT 103503_en_03
2.4 Error detection in I/O devices
Cross-circuit detection Cross circuits of the connected signal lines can be detected at the safe inputs.
A cross circuit is an unintentional, incorrect connection between redundant circuits.
Clock outputs T0 and T1 The safety module provides clock outputs T0 and T1 as an aid for detecting such a cross
circuit. The test pulses output here are asynchronous.
For example, if two differently clocked signals are routed back to two inputs of the safety
module along two channels via an emergency stop control device, a cross circuit can be
reliably detected in this emergency stop circuit. In the event of a cross circuit, the same
clock signal would be present at both inputs, instead of two different ones.
Figure 2-4 Implementing cross-circuit detection for an emergency stop control device
at inputs I0 and I1 of the safety module
Parameter editor in
SAFECONF
For this purpose, cross-circuit detection for the safety module inputs to be monitored must
be activated in the SAFECONF configuration software in the device parameterization editor
of the hardware editor.
SAFECONF configuration software specifies the clock signals to be used: for all "even"
inputs (I0, I2, I4, ..., I18), cross-circuit detection is implemented with test pulse T0. For
"odd" inputs (I1, I3, I5, ... I19), test pulse T1 must be used for cross-circuit detection.
S2 14
13
+24V
Reset
22
21
12
11
S1
Not-Halt
E-Stop
PSR-TRISAFE-S
103503a006.eps
Wiring the safety module with safe control
devices, sensors, and actuators
Other safe
functions/functi
onal blocks