WAGO 750 Manual page 79

WAGO I/O System 750 Commissioning 79
753-661/000-004 4FDI 24V PROFIsafe
For simple emergency stop applications without single fault security, you can use
a digital input for your safety function.
You can connect the digital input via a switching element (e.g., an emergency
stop switch) either to the associated clock output or directly to the +24 V field
supply voltage. Alternatively, you can connect the semiconductor output of a
sensor to the digital input directly. For single-channel use of a digital input, you
must set the Pre-Evaluation parameter to "Single-Channel."
If you do not connect the digital input via a switching element to the associated
clock output (e.g., OSSD semiconductor output), set the Short Circuit Test
parameter to "Deactivated." Otherwise, the F I/O module detects a short circuit on
the input and outputs the diagnostic message "Short circuit."
If you connect the digital input via the switching element to the associated clock
output, and the F I/O module should monitor the signal line for short circuits, you
must set the Short Circuit Test parameter to "Deactivated."
Mixed operation of inputs with the short circuit test activated and inputs with the
short circuit test deactivated is possible. If the short circuit test is deactivated for
all channels of a test phase, the associated clock output is switched off
permanently.
With this wiring, you can achieve a risk reduction of SIL2/Cat.2/PL d.
Manual
Version 1.0.0, valid from HW/SW Version 01/01