3. Instruction Set
3-215
Special register Function
D1070~D1085
Feedback data (ASCII) of Modbus communication. When PLC’s
RS-485 communication instruction receives feedback signals, the data
will be saved in the registers D1070~D1085 and then converted into
Hex in other registers.
RS instruction is not supported.
D1089~D1099
Sent data of Modbus communication. When PLC’s RS-485
communication instruction (MODRD) sends out data, the data will be
stored in D1089~D1099. Users can check the sent data in these
registers.
RS instruction is not supported
D1120
COM2 (RS-485) communication protocol. Refer to the following table in
point 4 for protocol setting.
D1121
COM1 (RS-232) and COM2 (RS-485) PLC communication address
when PLC is slave.
D1122
COM2 (RS-485) Residual number of words of transmitting data.
D1123
COM2 (RS-485) Residual number of words of the receiving data.
D1124
COM2 (RS-485) Definition of start character (STX) Refer to the
following table in point 3 for the setting.
Supported communication instruction:
RS
D1125
COM2 (RS-485) Definition of first ending character (ETX1) Refer to the
following table in point 3 for the setting.
Supported communication instruction:
RS
D1126
COM2 (RS-485) Definition of second ending character (ETX2) Refer to
the following table in point 3 for the setting.
Supported communication instruction:
RS
D1129
COM2 (RS-485) Communication time-out setting (unit: ms). If users set
up time-out value in D1129 and the data receiving time exceeds the
time-out value, M1129 will be set ON and the error code K1 will be
stored in D1130. M1129 has to be reset manually when time-out status
is cleared.
D1130
COM2 (RS-485) Error code returning from Modbus. RS instruction is
not included.
Supported communication instructions:
MODRD / MODWR / FWD /
REV / STOP / RDST / RSTEF / MODRW
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