8
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8.3 Using Link Special Relay (SB) and Link Special Register (SW)
8
PROGRAMMING
(4) Cable fault detection
Cable fault is checked through the CC IE Control Network Diagnostics, but it also can
be checked with link special relay (SB) and link special register (SW). (
10.3 CC IE Control Network Diagnostics)
(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 count (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)
When Clear OUT-side transmission error count (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)
4) 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.
Table 8.17 SB/SW used in checking for cable faults of other stations
No.
Description
No.
Description
SB0007
Clear IN-side transmission error count
—
SB0008
Clear OUT-side transmission error count
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
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