Lenze ELCAMZIxxx4SNNPSNN (LCU122) - Manual (Page 114)

Safety engineering
Safe inputs and safe outputs
Safe inputs
7

114 EDSLCMX3024-SPS EN 5.0
7.4.3 Safe inputs
7.4.3.1 General
ƒ Sensor type and sensor function cannot be parameterised.
ƒ The sensor signals are converted into PROFIsafe bit information and transmitted to
the master control for processing. A local evaluation is not carried out.
ƒ Unused sensor inputs must not be connected. The PROFIsafe bit of a non-connected
input is in the OFF state.

Note!
Make sure that an internal contact function test is carried out at the safe
inputs:
Safe input in the ON state
ƒ A LOW level at one channel puts the input in the OFF state. The discrepancy
monitoring starts simultaneously.
ƒ A LOW level must be detected at both channels within the discrepancy time,
otherwise a discrepancy error will be reported.
ƒ To be able to confirm the discrepancy error, a LOW level must be detected
before at both channels.
Safe input in the OFF state
ƒ A HIGH level at one channel starts the discrepancy monitoring.
ƒ A HIGH level must be detected at both channels within the discrepancy
time, otherwise a discrepancy error will be reported.
ƒ To be able to confirm the discrepancy error, a HIGH level must be detected
before at both channels.