8
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8.3 Using Link Special Relay (SB) and Link Special Register (SW)
8
PROGRAMMING
(5) Detection of cable disconnection and cable insertion errors
Cable disconnections and cable insertion errors are checked through the CC IE
Control Network Diagnostics, but they also can be checked with link special relay (SB)
and link special register (SW). (
Section 10.3 CC IE Control Network
(a) Checking for cable disconnection and cable insertion errors
1) When there is a cable disconnection or cable insertion error, loopback occurs.
When loopback occurs, loopback status (SB0065) is turned ON.
Also, loopback information can be checked in Loopback information (SB0065).
2) Stations where loopback has occurred can be checked with the following link
special relay (SW).
• IN-side loopback station No. (SW0070)
• OUT-side loopback station No. (SW0080)
3) The cause of loopback can be checked with the following link special register
(SW).
• IN-side loopback factor (SW0071)
• OUT-side loopback factor (SW0081)
4) When the cause of loopback is a cable insertion error, the station No. of the
station which has the cable insertion error is stored in the following link special
register (SW).
(The station No. to be stored is the one for connection target where the cable is
connected.)
• OUT-side mis-cabling station No. (SW0072)
• IN-side mis-cabling station No. (SW0082)
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.
Table 8.19 SB/SW used in checking for cable disconnections and cable insertion errors of other stations
No.
Description
No.
Description
SB0065
Loopback status
SW0065
Loopback information
—
SW0070
IN-side loopback station No.
SW0071
IN-side loopback factor
SW0072
OUT-side mis-cabling station No.
SW0080
OUT-side loopback station No.
SW0081
OUT-side loopback factor
SW0082
IN-side mis-cabling station No.
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