Lenze ELCAMZIxxx4SNNPSNN (LCU122) - Manual (Page 116)

Safety engineering
Safe inputs and safe outputs
Safe inputs
7
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116 EDSLCMX3024-SPS EN 5.0
7.4.3.2 Connection of passive sensors
The safe sensor inputs I1A, I1B and I2A, I2B are only suitable for equivalent switching
passive sensors.
To monitor passive sensors according to EN 954-1, cat. 3, the clock outputs CLA and CLB
must be wired. Please observe the following:
ƒ The clock outputs are only suitable for monitoring the passive sensors.
ƒ Always connect ...
– ... CLA with the A channel of the sensor input via the sensor.
– ... CLB with the B channel of the sensor input via the sensor.
– ... GCL with GIx of the sensor input.
ƒ The sensor inputs are tested cyclically through short LOW operation.
These errors are detected:
ƒ
Short circuit to supply voltage.
ƒ Short circuit between the input signals when different clock outputs are used.
ƒ Non-equivalent input signals after the discrepancy time has expired.
These errors are not detected:
ƒ Short circuit between the input signals when the same clock outputs are used.
Avoid unrecognisable errors by the installation, e.g. by separated cable routing.