Mitsubishi MELSEC-A Series Reference Manual page 252

9. PROGRAMMING
Device
Name
Number
Local station error
M9233
detected
Local station or
remote I/O station
M9235
parameter error
detected'
Local station or
remote I/O station
M9236 initial
communication
status
Local station or
M9237 remote I/O station
error
Local station or
remote I/O station
M9238
forward/reverse
loop error
Table 9.1 MELSECNET special link relays list (Continued)
Data
• Turned ON when a local station in the executed loop detects an error in
OFF : No error another station (M9255 ON).
ON : Error • Turned OFF automatically when the faulty station is returned to the normal
detected state or the data link returns to the normal status by switching the loop line.
(That is, M9233 is turned OFF when bits D9216 to D9219 are all OFF.)
• For local station: Parameter inconsistency was detected since devices
other than the link relay (B) and link register (W)ranges, (which are
assigned to the lower link master station) are assigned to link parameters
OFF : No error
for the lower link with link parameters for the upper link.
ON : Error
For remote I/O station : Error in I/O assignment, or neither inputs (X) nor
detected
outputs (Y) are set with the link parameters.
• Turned OFF when the error is eliminated by correcting the link parameters.
(That is, M9235 is turned OFF when bits D9220 to D9223 are all OFF.)
• Turned ON while a local station and/or remote I/O station is communicating
OFF : Not
the initial setting data (link parameter) to the master station to execute data
communi-
link processing.
cating
• Automatically turned OFF when the communication for initial data setting
ON : Communi-
has been completed. (That is, M9236 is turned OFF when bits D9224 to
cating
D9227 are all OFF.)
• Turned ON when an error occurs with one local station or remote I/O station
within the loop.
(The relay is turned ON while a station-to-station test is being executed for
OFF : Normal
a local station or a remote I/O station and the data link is operating.)
ON : Error
• Automatically turned OFF when the faulty station returns to the normal
status or the data link returns to the normal status by switching the loop line.
(That is, M9237 is turned OFF when bits D9228 to D9231 are all OFF.)
• Turned ON when an error occurs in the forward loop line or reverse loop
OFF : Normal
line of the local stations and remote I/O stations. (That is, M9238 is turned
ON : Error
OFF when bits D9232 to D9239 are all OFF.)
Description
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