6. Safety Functions
6-4
6.2
External Device Monitor (EDM)
Monitor output signal is to monitor the state of safety input signal with an external device.
Connect it to the terminal for external device monitor of safety device such as safety controller or safety
sensor.
Failure detection through EDM signal
You can detect failure of the safety input circuit and the EDM output circuit by monitoring the following 4
signal states from the external device.
In case of failure, there are two possible cases:
The EDM output signal is not turned on even when both the STO1 and 2 are off.
The EDM output signal is turned on even when one or both of the STO1 and 2 are on.
Signal Names
Function
STO1
ON
ON
OFF
OFF
STO2
ON
OFF
ON
OFF
EDM
OFF
OFF
OFF
ON
6.3
Example of Using the Safety Function
STO1+
STO1-
STO2+
STO2-
Driving Signal
M
~
Blocking
Bloc
king
7
8
EDM+
EDM-
4
3
6
5
STO
T33
EDM Output
Safety Unit
S14
S24
T31
+24V
A1
A2
T12
T22
Emitter
Receiver
Light
Curtain
T3
2
Y1
Summary of Contents for L7NHF Series
Page 2: ......
Page 14: ...Table of Contents xii ...
Page 60: ...2 Wiring and Connection 2 38 ...
Page 158: ...6 Safety Functions 6 6 ...
Page 172: ...7 Tuning 7 14 ...
Page 182: ...8 Procedure Function 8 10 ...
Page 192: ...9 Full Closed Control 9 10 ...
Page 214: ...10 Object Dictionary 10 22 ...
Page 363: ...11 Product Specifications 11 43 ...
Page 364: ......