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(1) Setting procedure
1. Configure the network in ring topology.
2. Select "Use" under "Loopback Function Setting" in the network configuration setting for the
master station (safety station).
Project data list [Parameter] [Network param] [Ethernet/CC IE/MELSECNET]
button button
(2) Program that detects loopback station numbers (master station (safety station)
only)
By detecting loopback station numbers, a faulty station can be found.
Whether loopback is being performed or not can be checked by Loopback function setting status (SB0078) and
Loopback status (SB0065).
Program that stores loopback station numbers to D1000 and D1001
For details on link special relay (SB) and link special register (SW), refer to the following.
Page 273, Appendix 3, Page 286, Appendix 4
(3) Precautions
(a) Loopback during safety communication
When an error occurs on the safety station which is in safety communication, the safety monitoring timeout
error may be detected before the loopback function is performed. If the safety monitoring timeout error is
detected, release the safety station interlock function, and resume safety communication. ( Page 100,
Section 8.1.3)
Select the checkbox.
Ex.
Data link status is checked.
Loopback station number 1 is stored.
Loopback station number 2 is stored.