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(3) Detecting line errors
Line errors are detected by CC-Link IE Field Network diagnostics, but can also be detected through link special
relays (SB) and link special registers (SW). ( Page 124, CHAPTER 9)
(a) Checking line errors on other stations
1. If other stations receive an error frame due to a line error, any of the following link special relays
(SB) will turn on.
• PORT1 error frame reception status (each station) (SB0120)
• PORT1 error frame reception status (master station) (SB0121)
• PORT2 error frame reception status (each station) (SB0130)
• PORT2 error frame reception status (master station) (SB0131)
• PORT1 error frame detection (each station) (SB0140)
• PORT1 error frame detection (master station) (SB0141)
• PORT2 error frame detection (each station) (SB0150)
• PORT2 error frame detection (master station) (SB0151)
2. When one of the link special relays (SB) shown above turns on, the station number that received
an error frame can be checked by link special register (SW) of the same number (other than
SB0121, SB0131, SB0141, and SB0151).
Details on the causes of error can be checked by link special relay (SB) and link special register (SW)
corresponding to the station number where the error has occurred. ( Page 227, Section 11.3 (3) (b))
Number Description Number Description
SB0120 PORT1 error frame reception status (each station)
SW0120 to
SW0127
PORT1 error frame reception status (each station)
SB0121 PORT1 error frame reception status (master station)
SB0130 PORT2 error frame reception status (each station)
SW0130 to
SW0137
PORT2 error frame status (present)
SB0131 PORT2 error frame reception status (master station)
SB0140 PORT1 error frame detection (each station)
SW0140 to
SW0147
PORT1 error frame detection (each station)
SB0141 PORT1 error frame detection (master station)
SB0150 PORT2 error frame detection (each station)
SW0150 to
SW0157
PORT2 error frame detection (each station)
SB0151 PORT2 error frame detection (master station)