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MELSEC-Q
6 PROGRAMMING
(b) Checking the forward/reverse loop of the host
1) When an error occurs on the forward or reverse loop, Host loop status
(SB0090) turns ON.
2) If loopback occurs, the cause of the loopback is stored in Loop switch
data (SW00D0 to SW00DF).
The position of the loop switch data storage can be checked with Loop
switch data pointer (SW00CF).
3) The loop status of the host can be checked with Loopback information
(SW0090).
4) The count of loop switching can be checked with Number of loop
switches (SW00CE).
5) Turning ON Clear loop switch count (SB0009) can clear SW00CE to
SW00DF.
No. Description No. Description
SB0009 Clear loop switch count —
SB0090 Host loop status SW0090 Loopback information
—
SW00CE Number of loop switches
SW00CF Loop switch data pointer
SW00D0 to
SW00DF
Loop switch data