6 FUNCTIONAL SAFETY
6.4 Safety sub-function
345
6
■
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.
• 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.
■
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.
Parameter
Name
PSD18
Permissible time for mismatches DI1
ON
OFF
ON
OFF
55B.1
No error occurs if the mismatch time is
within the permissible time.
Permissible time for mismatches
for safety input devices
SLS1C (SLS1 command)
ON (disabled)
OFF (enabled)
Operation status
SLS in progress
Normal operation
SLS in progress
SS1 in progress
Servo amplifier display
No display
CN8-4 pin
CN8-5 pin
ON
OFF
ON
OFF
CN8-4 pin
CN8-5 pin