Mitsubishi Electric Melsec QJ71LP21 Reference Manual page 213

6 PROGRAMMING
No.
SB0005 Clear retry count
SB0006 Clear communication error count
SB0007 Clear forward loop transmission errors
SB0008 Clear reverse loop transmission errors
6 - 20
(5) Checking cables for faults
The cable condition can be checked not only in the network diagnostics of GX
Developer but also with link special relays (SB) and link special registers (SW).
(Refer to Section 8.1.4.)
1) When a communication error occurs due to a cable fault, the error
count is stored in any of the link special registers (SW) in the table
below.
2) Turning ON Clear retry count (SB0005) will clear Number of retries
(SW00C8 and SW00C9).
Turning ON Clear communication error count (SB0006) will clear
Communication errors (SW00B8 to SW00C7).
Turning ON Clear forward loop transmission errors (SB0007) will clear
Line error on the forward loop side (SW00CC).
Turning ON Clear reverse loop transmission errors (SB0008) will clear
Line error on the reverse loop side ON (SW00CD).
Description No.
SW00B8 UNDER on the forward loop side
SW00B9 CRC on the forward loop side
SW00BA OVER on the forward loop side
SW00BB Short frame on the forward loop side
SW00BC Abort on the forward loop side (AB, IF)
SW00BD Timeout on the forward loop side (TIME)
Receiving 2k bytes or more on forward loop
SW00BE
side (DATA)
SW00BF DPLL error on the forward loop side
SW00C0 UNDER on the reverse loop side
SW00C1 CRC on the reverse loop side
SW00C2 OVER on the reverse loop side
SW00C3 Short frame on the reverse loop side
SW00C4 Abort on the reverse loop side (AB, IF)
SW00C5 Timeout on the reverse loop side (TIME)
Receiving 2k bytes or more on reverse loop
SW00C6
side (DATA)
SW00C7 DPLL error on reverse loop side
SW00C8 Number of retries on the forward loop side
SW00C9 Number of retries on the reverse loop side
SW00CC Line error on the forward loop side
SW00CD Line error on the reverse loop side
MELSEC-Q
Description
6 - 20