External Device Monitor (Edm1) - YASKAWA JUSP-MD D01A Series User Manual

5.11.2 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 function device.
Note: To meet the performance level d (PLd) in EN ISO13849-1, the EDM signal must be monitored by a host controller.
If the EDM signal is not monitored by a host controller, the system only qualifies for the performance level c (PLc).
 Failure Detection Signal for EDM1 Signal
The relation of the EDM1, /HWBB1, and /HWBB2 signals is shown below.
Detection of failures in the EDM1 circuit can be checked using the following four status of the EDM1 signal
in the table. Failures can be detected if the failure status can be confirmed, e.g., when the control power supply
is turned ON.
Signal
Name
/HWBB1 ON
/HWBB2 ON
EDM1 OFF
• The EDM1 signal is not a safety output. Use it only for monitoring a failure.
(1) Connection Example and Specifications of EDM1 Output Signal
Connection example and specifications of EDM1 output signal are explained below.
Logic
ON OFF
OFF ON
OFF OFF
WARNING
For safety function signal connections, the input signal is the 0 V common and the output
signal is the source output. This is opposite to other signals described in this manual. To
avoid confusion, the ON and OFF status of signals for safety functions are defined as fol-
lows:
ON: The state in which the relay contacts are closed or the transistor is ON and current
flows into the signal line.
OFF: The state in which the relay contacts are open or the transistor is OFF and no cur-
rent flows into the signal line.
OFF
OFF
ON
5.11 Safety Function
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