Lenze E94AYAD - SM300 - Manual (Page 20)

Safety engineering
Device modules
Connection of safety sensors
1
1.2
1.2.4

1.2-10 EDS94AYAD EN 2.2
1.2.4.2 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.
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.
GCL
GI2
I2B
I2A
GCL
GI1
I1A
I1B
CLB
CLA
S1
S2
V
CC
ы
ы
SM300
E94AYAD
SSP94SM351
Fig. 1.2-4 Ways to detect errors
8 Unrecognisable errors