Mitsubishi Electric MELSEC-Q Series - Page 313

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CHAPTER 8 PROGRAMMING
8
8.3 Using Link Special Relay (SB) and Link Special Register (SW)
(4) Cable fault detection
Cable fault is checked through the CC IE Control diagnostics, but it also can be checked with link special relay
(SB) and link special register (SW). ( Page 526, Section 10.3)
(a) Checking for cable faults of other stations
1. If another station receives an error frame through a cable fault, either of the following link special
relay (SB) is turned ON.
• Current IN-side error frame reception status (SB0120)
• Current OUT-side error frame reception status (SB0130)
• IN-side error frame reception detection status (SB0140)
• OUT-side error frame reception detection status (SB0150)
2. When the link special relay (SB) shown in above 1) is turned ON, the station No. of the other
station that received an error frame can be checked with the link special register (SW) of the same
number.
3. When Clear IN-side transmission error counter (SB0007) is turned ON, the following link special
relay (SB) and link special register (SW) can be cleared.
• IN-side error frame reception detection status (SB0140)
• IN-side error frame reception detection status (SW0140 to SW0147)
4. When Clear OUT-side transmission error counter (SB0008) is turned ON, the following link special
relay (SB) and link special register (SW) can be cleared.
• OUT-side error frame reception detection status (SB0150)
• OUT-side error frame reception detection status (SW0150 to SW0157)
5. The details of the cause of an error can be checked with the link special relay (SB) and link special
register (SW) of the station No. for a station where the error has occurred.
No. Description No. Description
SB0007 Clear IN-side transmission error counter
—
SB0008 Clear OUT-side transmission error counter
SB0120 Current IN-side error frame reception status
SW0120 to
SW0127
Current IN-side error frame reception status
SB0130 Current OUT-side error frame reception status
SW0130 to
SW0137
Current OUT-side error frame reception status
SB0140 IN-side error frame reception detection status
SW0140 to
SW0147
IN-side error frame reception detection status
SB0150
OUT-side error frame reception detection
status
SW0150 to
SW0157
OUT-side error frame reception detection
status