Short Circuit Test Ix Parameter; 753-661/000-004 4Fdi 24V Profisafe; Table 28: Assignment Of Inputs To Clock Outputs - WAGO 750 Manual

WAGO I/O System 750

753-661/000-004 4FDI 24V PROFIsafe

7.3.5.2

Short Circuit Test Ix Parameter

Protected installation of signal lines required
When connecting signal lines to the digital inputs of the F I/O module, it is
essential to ensure that signals are transmitted within a cable or non-metallic
sheathed cable only if their short circuit does not lead to a dangerous failure of
the safety function, or if they are signals supplied by different clock outputs.
Therefore, make sure that the signal lines are installed in accordance with
IEC 60204-1 or ISO 13849-2 (e.g., as separate sheathed lines or in separate
cable ducts).
The digital inputs are tested cyclically by the F I/O module. If the Short Circuit
Test parameter is set to the value "Deactivated," then the F I/O module only tests
the input circuit for internal errors. You can set the Short Circuit Test parameter
to "Deactivated" if, for example, you connect the OSSD semiconductor output of
a sensor (such as light arrays, light barriers, etc.) to the digital input of the F I/O
module.
If you set the Short Circuit Test parameter to the value "Activated," you must
connect the digital input to the associated clock output via a switching element.
This ensures that the F I/O module tests the signal line for short circuits against
external voltages. If the short circuit test detects an external voltage at the digital
input, the input signal is passivated and the "Short Circuit" diagnostic message is
output to the secure PLC.

Table 28: Assignment of Inputs to Clock Outputs

Inputs
I1, I3
I2, I4
Associated clock output (when short circuit test activated)
"Standard" Operating Mode
T1
T2
Version 1.0.0, valid from HW/SW Version 01/01
Commissioning
"Rotary Table" Operating Mode
T1
T1
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