3. Instruction Set
3-267
Special
register
Function
the data will be stored in D1256~D1295. Users can check the sent data in
these registers.
Supported communication instruction: MO
DRW
D1296~D1311
For COM2 RS-485 MODRW instruction. D1296~D1311 store the
converted hex data from D1070 ~ D1085 (ASCII). PLC automatically
converts the received ASCII data in D1070 ~ D1085 into hex data.
Supported communication instruction: MO
DRW
3. PLC COM3 RS-485: Associated flags (Auxiliary relays) and special registers (Special D) for
communication instructions RS / MODRW and FWD / REV / STOP / RDST / RSTEF when
M1177 = ON.
Flag Function Action
M1136
COM3 retain communication settings. Communication settings will
be reset (changed) according to the content in D1109 after every
scan cycle. Users can set ON M1136 if the communication protocol
requires to be retained. When M1136 = ON, communication settings
will not be reset (changed) when communication instructions are
being processed, even if the content in D1109 is changed
User
sets and
resets
M1320
COM3 ASCII / RTU mode selection. ON : RTU mode, OFF: ASCII
mode.
M1316
COM3 sending request. Before executing communication
instructions, users need to set M1316 to ON by trigger pulse, so that
the data sending and receiving will be started. When the
communication is completed, PLC will reset M1316 automatically.
User
sets,
system
resets
M1317
Data receiving ready. When M1317 is ON, PLC is ready for data
receiving.
System
sets
M1318 COM3 data receiving completed.
System
sets,
user
resets
M1319
COM3 data receiving error. M1319 will be set ON when errors occur
and the error code will be stored in D1252
System
sets,
user
resets
To Next Page
Loading...
