Mitsubishi Electric MELSERVO-J5 MR-J5 Series User Manual page 337

■Diagnosis with test pulses
• Test pulse diagnosis function
When the output signal of the CN8-6/CN8-7 pin is on, off-pulses are output periodically to diagnose wiring abnormalities.
The following shows the operation sequence when STOS (STO output) is assigned to the output signal of the CN8-6/CN8-7
pin. When STOS (STO output) is on, off-pulses are output to the CN8-6/CN8-7 pin periodically. Off-pulses are output from the
CN8-6 pin and CN8-7 pin at different timings. The width of the off-pulses can be set with [Pr. PSD30 Output device - Test
pulse off time]. Set the off-pulse width so that external devices are not affected by the output of off-pulses.
ON
STOS (STO output)
OFF
ON
CN8-6 pin
OFF
ON
CN8-7 pin
OFF
If an error is detected by the test pulse diagnosis, [AL. 556 Output device diagnosis error (safety sub-function)] occurs.
Whether or not to perform diagnosis on output devices using test pulses can be selected with [Pr. PSD29 Output device - Test
pulse diagnosis execution selection].
• Setting functional safety parameters
For the output devices that are assigned with [Pr. PSD08 Output device selection DO1], set the following parameters.
Parameter
PSD29
PSD30
Set whether to execute test pulse diagnosis in [Pr. PSD29 Output device - Test pulse diagnosis execution selection]. Set the
off time of the test pulses output from the output device in [Pr. PSD30 Output device - Test pulse off time].
The achievable safety level is influenced by the devices used and the setting of this functional safety parameter. Refer to the
following for details.
Page 329 Achievable safety level
Safety output device test pulse off time
Name
Output device - Test pulse diagnosis execution selection
Output device - Test pulse off time
Safety output device test pulse off time
6 FUNCTIONAL SAFETY
6.4 Safety sub-function
6
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