Omron OMNUC G5 R88M-K series User Manual page 270

7-1 Safe Torque OFF (STO) Function
External Device Monitor (EDM) Output Signal
This is a monitor output signal that is used to monitor the status of safety input signals using
an external device.
Connect a safety equipment, such as a safety controller or a safety sensor, to the external
device monitoring terminal.
Signal name
EDM output
Relationship Between Safety Input Signal and EDM Output Signal
Normally when both of the Safety inputs 1 and 2 are off, i.e., when the STO function works for
both safety input circuits, the EDM output is on.
You can detect a failure of the safety input circuit and the EDM output circuit by monitoring all
of the following 4 signal statuses using an external device.
These are the two cases of errors:
7
 Both of the Safety inputs 1 and 2 are off. But the EDM output circuit signal does not become on.
 Either or both the Safety inputs 1 or/and 2 are on. But the EDM output circuit signal is on.
Safety input 1
Safety input 2
EDM output
 The maximum delay time is 6 ms after the safety input signal is input and until the EDM output
signal is output.
7-3
Symbol
number
EDM CN8-8
EDM CN8-7
Signal name Symbol
SF1
SF2
EDM
OMNUC G5-Series AC Servo Drives Users Manual (Built-in MECHATROLINK-II communications type)
Pin
Description
• Monitor signal is output to detect
malfunctioning of the safety
function.
* This output signal is not a safety
output.
Signal status
ON ON OFF
ON OFF ON
OFF OFF OFF
CONTROL mode
Position Speed Torque
  
  
OFF
OFF
ON
Full
closing

