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Hardware: PSR-TRISAFE-S safety module
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3-9
3.4.3 Alarm outputs M0 to M3
The non-safety-related alarm outputs M0, M1, M2, and M3, are designed as digital
semiconductor outputs for 24 V DC/100 mA.
These alarm outputs can be used for example to control a standard PLC or a detector unit
(e.g., a signal lamp).
As is the case for safe inputs and outputs, the alarm outputs are linked in the connection
editor of SAFECONF (see "Adding and connecting functions, functional blocks, and signals
in the safety logic" on page 4-11).
3.4.4 Test pulse outputs T0 and T1
The test pulses output at outputs T0 and T1 are used for cross-circuit detection at the inputs.
Each output is available twice. The output test pulses T0 and T1 are asynchronous, i.e., T0
does not equal T1.
To implement cross-circuit detection, the relevant safe inputs must be configured
accordingly using the device parameterization editor (part of the hardware editor in
SAFECONF).
The SAFECONF configuration software specifies the clock signals to be used: Cross-circuit
detection is implemented with test pulse T0 for "even" inputs (I0, I2, I4, ... I18). For "odd"
inputs (I1, I3, I5, ... I19), test pulse T1 must be used for cross-circuit detection.
Please also refer to "Signal inputs" on page 3-7 and "Error detection in I/O devices" on
page 2-8.
3.4.5 24 V/0 V supply connection
The 24 V/0 V supply connection is used to supply the outputs of the safety module and the
clock and ground switching outputs with power.
3.4.6 Supply connections A1 and A2
The supply connection A1/A2 is used to supply the logic of the safety module and the alarm
outputs with power.
At the double terminal block contacts, 2 and 3-wire sensors and control devices can be
supplied directly by the safety module (U
nom
= 24 V DC).
NOTE: Alarm outputs must not be connected in parallel.
Feedback to alarm outputs is not permitted.
VORSICHT: For 3-wire sensors, ensure that the GND potential of the sensor/control
device matches the GND potential of the safety module.
The maximum continuous current for devices connected to terminal blocks A1 and A2 is
6 A (limiting continuous current for looped through current paths A1/A1 and A2/A2).