Mitsubishi Electric MELSERVO-J5 User Manual page 439

■Duplication of the input wiring
• Duplication of the input wiring
Switch the CN8-4/CN8-5 pin within the permissible time for mismatches.
This function continuously monitors whether signals of duplicated input are matched. When a mismatch is detected, the
corresponding input device is treated as off. The following shows the operation sequence when SLS1C (SLS1 command) is
assigned to the input signal of the CN8-4/CN8-5 pin. SLS1C (SLS1 command) is off while the CN8-4 and CN8-5 pin are
mismatched. SLS1C (SLS1 command) is on when both the CN8-4 pin and CN8-5 pin turn on. If the mismatch continues for
longer than the permissible time for mismatches specified by the parameter, [AL. 557 Input device mismatch detection (safety
sub-function)] occurs and the SS1 function is activated.
ON
CN8-4 pin
OFF
ON
CN8-5 pin
OFF
ON (disabled)
SLS1C (SLS1 command)
OFF (enabled)
Servo amplifier display
Operation status
• Setting functional safety parameters
For the input devices that are assigned with [Pr. PSD02 Input device selection DI1], set the following parameter. Setting the
permissible time for mismatches to 0 disables the diagnosis.
Parameter
PSD18
■Diagnosis with test pulses
• When connecting a device that has a diagnosis function (safety controller, etc.)
Use the diagnosis function of the device to diagnose the external wiring.
Check that the wiring is properly done so as to allow execution of the test pulse diagnosis.
Input off-pulses at different timings to the CN8-4 pin and CN8-5 pin periodically.
ON
CN8-4 pin
OFF
ON
CN8-5 pin
OFF
No error occurs if the mismatch time is
within the permissible time.
SLS in progress Normal operation
Name
Permissible time for mismatches DI1
Permissible time for mismatches
for safety input devices
No display
SLS in progress
55B.1
SS1 in progress
6 FUNCTIONAL SAFETY
437
6.4 Safety sub-function
6