2 external device monitor (edm1), Warning – Yaskawa Sigma-5 User Manual: Design and Maintenance - Rotary Motors User Manual
Page 132

4.6 Safety Function
4-49
Operation
4.6.2 External Device Monitor (EDM1)
The external device monitor (EDM1) functions to monitor failures in the HWBB function. Connect the moni-
tor to feedback signals to the safety unit. The relation of the EDM1, /HWBB1, and /HWBB2 signals is shown
below.
Failure Detection Signal for EDM1 Signal
Detection of failures in the EDM1 circuit can be checked using the status of the 3 signals in the table. Failures
can be detected if the failure status can be confirmed, such as when the power supply is turned ON.
Signal
Name
Logic
/HWBB1
ON
ON
OFF
OFF
/HWBB2
ON
OFF
ON
OFF
EDM1
OFF
OFF
OFF
ON
When both /HWBB1 and /
HWBB2 signals are OFF,
EDM1 signal turns ON.
WARNING
The EDM1 signal is not a safety output. Use it only for monitoring a failure.
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