Parameter Short-Circuit Test Ix; Table 33: Input /Clock Output Assignment - WAGO -I/O-SYSTEM 750 Series Manual

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8.3.4.2

Parameter Short-Circuit Test Ix

Protect signal lines when installing!
When connecting signal lines to the digital inputs of the PROFIsafe I/O module,
make sure that only the following signals are transmitted within a cable or non-
metallic sheathed cable:
• Those whose short-circuit does not lead to a dangerous failure of the safety
function
• Those supplied by different clock outputs
Therefore, please make sure that the signal lines are installed in accordance with
EN 60204-1 or EN ISO 13849-2 (e.g., as separate sheathed lines or in separate
cable ducts).
The digital inputs are tested cyclically by the PROFIsafe I/O module. If the
Short-circuit test parameter is set to the "not active" value, then the PROFIsafe
I/O module only tests the input circuit for internal errors. You have to set the
Short-circuit test parameter to "not active" if, for example, you connect the
semiconductor output of a sensor (such as light arrays, light barriers, etc.) to the
digital input of the PROFIsafe I/O module.
If you set the Short-circuit test parameter to the "active" value, then you have to
connect the digital input to the associated clock output via a switching element
(e.g., break contact). By doing so, the PROFIsafe I/O module tests the signal line
for short circuits against external voltages. If the short circuit test detects an
external voltage on the digital input, the PROFIsafe I/O module is passivated and
the "Short circuit" diagnostic message is output to the safe PLC.

Table 33: Input /Clock Output Assignment

Inputs
I1, I3
I2, I4
Using the cyclical tests of the digital inputs, the PROFIsafe I/O module detects the
following errors on the digital inputs:
753-661/000-003 4FDI 24V PROFIsafe V2 iPar
Associated Clock Output (for Activated Short-Circuit Test)
Version 1.4.0, valid from HW/SW Version 01/02
WAGO-I/O-SYSTEM 750
T1
T2
Manual