7-3
7-1 Safe Torque OFF (STO) Function
OMNUC G5-SERIES AC SERVOMOTOR AND SERVO DRIVE USER'S MANUAL
7
Safety 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 device, such as a safety controller or a safety sensor. Connect the EDM
output signal to the monitoring terminal on a safety device.
Relationship Between Safety Input Signals and EDM Output Signal
Normally when both safety inputs 1 and 2 are OFF, i.e., when the STO function is activated 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 states using an external device.
Errors occur in the following two cases:
Both safety inputs 1 and 2 are OFF, but the EDM output circuit signal does not turn ON.
Either or both safety inputs 1 and 2 are ON, but the EDM output circuit signal is ON.
The maximum delay time is 6 ms after the safety input signal is input until the EDM output signal
is output.
Signal name
Symbol
Pin
number
Description
Control mode
Position
Speed Torque
Fully-
closed
EDM output
EDM+ CN8-8
• A monitor signal is output to
detect a safety function failure.
* This is not a safety output.
√√√ √
EDM− CN8-7 √√√ √
Signal name
Symbol
Signal status
Safety input 1 SF1 ON ON OFF OFF
Safety input 2 SF2 ON OFF ON OFF
EDM output EDM OFF OFF OFF ON
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