Mitsubishi Electric MELSEC Q Series Reference Manual page 224

6 PROGRAMMING
No.
SB0005 Clear retry count
SB0006 Clear communication error count
SB0007 Clear forward loop transmission errors
SB0008 Clear reverse loop transmission errors
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(4) 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 (SW00CD).
Description
—
No.
—
UNDER on the forward loop side/coaxial bus
SW00B8
UNDER
CRC on the forward loop side/coaxial bus
SW00B9
CRC
OVER on the forward loop side/coaxial bus
SW00BA
OVER
Short frame on the forward loop side/coaxial
SW00BB
bus short frame
Abort on the forward loop side (AB, IF)/coaxial
SW00BC
bus abort (AB. IF)
Timeout on the forward loop side (TIME)/
SW00BD
coaxial bus timeout (TIME)
Receiving 2k bytes or more on forward loop
SW00BE side (DATA)/coaxial bus receiving 2k bytes or
more (DATA)
DPLL error on the forward loop side/coaxial
SW00BF
bus DPLL error
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 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
Number of retries on the forward loop side/
SW00C8
coaxial bus retries error
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
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