3. Instruction Set
3-213
Flag Function Action
M1121
Data transmission ready. M1121 = OFF indicates that RS-485 in
COM2 is transmitting
System
sets
M1122
Sending request. Before executing communication instructions,
users need to set M1122 to ON by trigger pulse, so that the data
sending and receiving will be started. When the communication is
completed, PLC will reset M1122 automatically.
User sets,
system
resets
M1123
Data receiving completed. When data receiving of communication
instructions is completed, M1123 will be ON. Users can process the
received data when M1123 is ON. When data processing is
completed, M1123 has to be reset by users.
Supported communication instructions:
RS
System
sets ON
and user
resets
M1124
Data receiving ready. When M1124 is ON, PLC is ready for data
receiving..
System
sets
M1125
Communication ready status reset. When M1125 is set ON, PLC
resets the communication (transmitting/receiving) ready status.
M1125 has to be reset by users after resetting the communication
ready status.
M1126
Set STX/ETX as user-defined or system-defined in RS
communication. For details please refer to the table in point 5.
M1126 only supports RS instruction.
M1130
Set STX/ETX as user-defined or system-defined in RS
communication. For details please refer to the table in point 5.
M1130 only supports RS instruction
User
sets/resets
M1127
COM2 (RS-485) data sending/receiving/converting completed. RS
instruction is NOT supported.
Supported communication instructions:
MODRD / MODWR / FWD / REV / STOP / RDST / RSTEF /
MODRW
System
sets and
user resets
M1128
Transmitting/receiving status indication.
System
sets
M1129
Receiving time out. If users set up time-out value in D1129 and the
data receiving time exceeds the time-out value, M1129 will be set
ON.
System
sets and
user resets
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