5
MZM 120
Operating instructions
Safety switch with interlocking function
EN
6.2 Safety switch with conventional diagnostic output
The short-circuit proof diagnostic output OUT can be used for central
visualisation or control functions, e.g. in a PLC. This is not a safety-
relevant output!
Error
Errors, which no longer guarantee the function of the safety switch with
interlocking function (internal errors) cause the safety outputs to be
disabled within the risk time. Any error that does not immediately affect
the safe functionality of the safety switch with interlocking function (e.g.
the ambient temperature too high, interference potential at a safety out-
put, cross-wire short) will lead to a delayed shut-down (refer to table 2).
After fault rectification, the sensor can be reset by opening the relevant
guard door.
If more than one fault is detected at the safety outputs, the
component will be electronically locked and a normal fault
reset will no longer be possible.
To reset this type of interlocking, the component must be
isolated from the power supply after elimination of the error
causes.
Error warning
A fault has occured, which causes the safety outputs to be disabled af-
ter 30 minutes. The safety outputs initially remain enabled. This enables
the shutdown of the process in a controlled manner. An error warning is
deleted when the error cause is eliminated.
Behaviour of the diagnostic outputs of the W variant
Input signal magnet control
IN
Normal sequence, door was locked
OUT
Door could not be locked or fault
OUT
Legend
Safety guard open
Safety guard closed
unlock guard
Safety guard locked
Locking time
Guard not locked or fault
Evaluation of the diagnostic outputs
SPS/PLC
MZM 100
I N
O U T
E 1 . 0
A 1 . 0
M 1 . 0
M 2 . 0
A 1 . 0
E 1 . 0
&
A 1 . 0
E 1 . 0
&
Door can be locked
IN = 1 = locking
Door is locked
Table 1: the diagnostic function of the MZM 120 safety switch with additional interlocking function
The diagnostic output OUT signals faults before the safety outputs are disabled, thus enabling a controlled shutdown.
System condition
Solenoid control
LED
LED
LED
Safety outputs
Diagnostic output
IN
green red
yellow
Y1, Y2
OUT
Safety guard open
0 V
On
Off
Off
0 V
0 V
Safety guard closed, actuator in,
safety guard can be locked
0 V
On
Off
Flashes
24 V
24 V
Safety guard closed and locked
24 V
On
Off
On
24 V
24 V
Solenoid interlock cannot be locked,
safety guard not correctly closed or
solenoid soiled
24 V
On
Off
Off
0 V
0 V
Error warning
1)
, actuator in
0 V / 24 V
On
flashes
2)
flashes/on 24 V
0 V
Error
0 V / 24 V
On
flashes
2)
Off
0 V
0 V
1)
after 30 min -> fault
2)
refer to flash code
