High−level Instructions
3 − 340
Specifications for each item
The control data specified by [S1][S1+1] is specified as follows.
[S1]: Specifying transmission unit and transmission method
Specifies No. of transmisson words (H001 to H07F)
*According to the restrictions on the MODBUS protocol.
Word unit
transmission
[S1]:
H0
Bit No. of local
unit (H0 to HF)
Bit No. of remote
unit (H0 to HF)
[S1]:
Bit unit transmis-
sion
H0 fixedH8
[S1+1]: Specifying the remote unit
Unit No. (H00 to H63)
(0 to 99)
[S1+1]:
H0 fixed
Selects COM port
(H1 or H2)
(1) Specifying the transmission unit and transmission method [S1]
If data is to be sent in word units, specify the data volume, and if it is to be sent in bit units, specify the position of the
target bit.
*In word units, the maximum of 127 (7Fh) words can be transmitted as the transmission range is up to 254 bytes.
(2) Specifying the remote unit [S1+1]
Specify the remote unit with the unit number. When H00, it is global transmission. (No response)
Specify either the COM1 or COM2 port from which data is transmitted to the remote unit.
Specify H1 if only one COM port is available.
(3) Specify the area of the local unit by [S2] in which the data to be transmitted is stored
Specify the memory area of the local unit in which the data to be transmitted is stored.
(4) Specify the area of the remote unit for storing by [D] and [N].
Specify 0 for the device No. of [D].
Specify the memory area of the remote unit in which the data to be transmitted is stored, specifying the type D and the
address N in combination.
[D]:DT0, [N]:K100
DT100
Example)
The MODBUS command is created according to the operands specified by [S1],[S1+1], [S2], [D], and
[N].
When being transmitted in word units: The command 06 (DT1 word write), command 15 (Y, R
multi−points write) and command 16 (DT multi−words write) can be transmitted.
When being transmitted in bit units: The command 05 (Y, R single point write) can be transmitted.
The transmission is executed adding the 2 bytes of CRC at the end after the MODBUS command has
been created.
FPΣ/FP−X/FP0R
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