Mitsubishi Electric MELSEC-Q Series User Manual page 204

Number
SB0047 Baton pass status (own station)
SB0049 Data link status (own station)
(3) Detecting line errors
Number
SB0120 PORT1 error frame reception status (each station)
PORT1 error frame reception status (master
SB0121
station)
SB0130 PORT2 error frame reception status (each station)
SB0140 PORT1 error frame detection (each station)
SB0141 PORT1 error frame detection (master station)
SB0150 PORT2 error frame detection (each station)
(b) Checking data link status (own station)
1) Link scan time can be checked using "[Md.134] Operation time" and "[Md.135]
Maximum operation time".
2) If an error occurs in data link, one of the following link special relays (SBs) will
turn on.
• Baton pass status (own station) (SB0047)
• Data link status (own station) (SB0049)
3) The cause of error will be stored in the following link special registers (SWs).
• Baton pass status (own station) (SW0047)
• Cause of baton pass interruption (SW0048)
• Cause of data link stop (SW0049)
Description
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Line errors are detected using the CC-Link IE Field Network diagnostics as well as link
special relays (SBs) and link special registers (SWs). (Refer to Chapter 9.)
(a) Checking line errors on other stations
1) If other stations receive an error frame due to a line error, one of the following
link special relays (SBs) 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)
• PORT1 error frame detection (each station) (SB0140)
• PORT1 error frame detection (master station) (SB0141)
• PORT2 error frame detection (each station) (SB0150)
2) When one of the link special relays (SBs) listed above turns on, the station
number that received an error frame can be checked using link special
registers (SWs) of the same number (other than SB0121 and SB0141).
Details on the causes of error can be checked using link special relays (SBs) and
link special registers (SWs) corresponding to the station number where the error
has occurred. (Refer to Section 11.3 (3) (b).)
Description
Number
SW0047 Baton pass status (own station)
SW0048 Cause of baton pass interruption
SW0049 Cause of data link stop
Number
SW0120 to
PORT1 error frame reception status (each station)
SW0127
SW0130 to
PORT2 error frame reception status (each station)
SW0137
SW0140 to
PORT1 error frame detection (each station)
SW0147
SW0150 to
PORT2 error frame detection (each station)
SW0157
11 - 18
Chapter 11 PROGRAMMING
Description
Description
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