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MELSEC-Q
11 TROUBLESHOOTING
Special Relay List (Continued)
ACPU
Special
Relay
Special
Relay after
Conversion
Special
Relay for
Modification
Name
Meaning
Details
Applicable
CPU
M9200 SM1200
ZNRD instruction
(LRDP instruction
for ACPU)
reception (for
master station)
OFF : Not accepted
ON : Accepted
• Depends on whether or not the ZNRD (word device read)
instruction has been received.
• Used in the program as an interlock for the ZNRD
instruction.
• Use the RST instruction to reset.
M9201 SM1201
ZNRD instruction
(LRDP instruction
for ACPU)
completion (for
master station)
OFF : Not completed
ON : End
• Depends on whether or not the ZNRD (word device read)
instruction execution is complete.
• Used as a condition contact for resetting SM1202 and
SM1203 after the ZNRD instruction is complete.
• Use the RST instruction to reset.
M9202 SM1202
ZNWR instruction
(LWTP instruction
for ACPU)
reception (for
master station)
OFF : Not accepted
ON : Accepted
• Depends on whether or not the ZNWR (word device
write) instruction has been received.
• Used in the program as an interlock for the ZNWR
instruction.
• Use the RST instruction to reset.
M9203 SM1203
ZNWR instruction
(LWTP instruction
for ACPU)
completion (for
master station)
OFF : Not completed
ON : End
• Depends on whether or not the ZNWR (word device
write) instruction execution is complete.
• Used as a condition contact to reset SM1202 and
SM1203 after the ZNWR instruction is complete.
• Use the RST instruction to reset.
M9204 SM1204
ZNRD instruction
(LRDP instruction
for ACPU)
reception (for local
station)
OFF : Not completed
ON : End
On indicates that the ZNRD instruction is complete at the
local station.
M9205 SM1205
ZNWR instruction
(LWTP instruction
for ACPU)
recep-tion (for
local station)
OFF : Not completed
ON : End
On indicates that the ZNWR instruction is complete at the
local station.
M9206 SM1206
Host station link
parameter error
OFF : Normal
ON : Abnormal
Depends on whether or not the link parameter setting of
the host is valid.
M9207 SM1207
Link parameter
check results
OFF : YES
ON : NO
Depends on whether or not the link parameter setting of
the master station in tier two matches that of the master
station in tier three in a three-tier system.
(Valid only for the master stations in a three-tier system.)
M9208 SM1208
Sets master
station B and W
transmission
range (for lower
link master
stations only)
OFF : Transmits to tier2 and
tier 3
ON : Transmits to tier2 only
• Depends on whether or not the B and W data controlled
by higher-link master station (host station) is sent to
lower-link local stations (tertiary stations).
• When SM1208 is OFF.......B and W of host station is
sent to tertiary stations.
• When SM1208 is ON.........B and W of host station is
not sent to tertiary stations.
M9209 SM1209
Link parameter
check command
(for lower link
master stations
only)
OFF : Executing the check
function
ON : Check non-execution
• Set to ON not to match B and W of the higher and lower
links. (When SM1209 is ON, the link parameters of the
higher and lower links are not checked.)
• When SM1209 is OFF, the link parameters of the higher
and lower links are checked.
M9210 SM1210
Link card error (for
master station)
OFF : Normal
ON : Abnormal
Depends on presence or absence of the link card
hardware error. Judged by the CPU.
M9211 SM1211
Link module error
(for local station
use)
OFF : Normal
ON : Abnormal
Depends on presence or absence of the link card
hardware error. Judged by the CPU.
M9224 SM1224
Link status
OFF : Online
ON : Offline,station-to-station
test, or self-loopback
test
Depends on whether the master station is online or offline
or is in station-to-station test or self-loopback test mode.
M9225 SM1225
Forward loop error
OFF : Normal
ON : Abnormal
Depends on the error condition of the forward loop line.
M9226 SM1226
Reverse loop error
OFF : Normal
ON : Abnormal
Depends on the error condition of the reverse loop line.
M9227 SM1227
Loop test status
OFF : Not being executed
ON : Forward or reverse loop
test execution underway
Depends on whether or not the master station is executing
a forward or a reverse loop test.
M9232 SM1232
Local station
operation status
OFF : RUN or STEP RUN
status
ON : STOP or PAUSE status
Depends on whether or not a local station is in STOP or
PAUSE mode.
QnA