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High
−
level Instructions
3
−
372
Specifications for each item
[S1]: Specifying port number, transmission command and destination unit number
Specifies
transmission
command
Selects COM
port
[S1]:
H1 or H2
Unit No. (H01 to HFF)
H1 H2 H3 H4
(1) Specifying COM port
Specify H1 for COM 1 port, and H2 for COM2 port.
If only one COM port is available, specify H1.
(2) Specifying transmission command.
Any one of H1, H2, H3 and H4 can be specified.
(3) Specifying destination unit number
Numbers in the range of H1 to HFF can be specified.
Specifying the MODBUS address of the destination unit where data is transmitted by [S2].
Settable address: H0 to HFFFF
Specifying the number of data received by [N]
Settable number of data
For bit data: Max. 2040 (07F8H)
For word data: Max. 127 (7FH)
Specifying the area by [D] in which the data to be received is stored.
Specify the starting number of the operation memory of the destination unit in which the data to be
received is stored.
This instruction can be executed even if the transmission command specified by [S1] and the device
type in the destination unit differs.
That means the contents of DT can be transmitted by specifying the bit data, or the contents of WR
can be transmitted by specifying the word data.
When the command 1 or 2 is specified, data is always stored from the bit 0 of [D].
Explanation of command
Command 01 (Coil status read)
Example) When 1 bit is read from the bit address H7788 of the unit No. 17 connected to the COM1 and written
in the bit of DT100 of the local unit.
[ F146(RECV), H1111,H7788, K1, DT100 ]
[S1]:
H1
H1
H1
Unit No. (H01 to HFF)
Selects COM port
H1
MODBUS commands
Slave address
Command (01H)
Starting No. of read (H)
Starting No. of read (L)
Quantity to read (H)
Quantity to read (L)
CRC16 (H)
CRC16 (L)
11
01
77
88
00
01
64
C4
1
2
3
4
5
6
7
8
Command
conversion
[S1]:H1111
[S2]:H7788
[N] :K1
[D] :DT100
FP
Σ
/FP
−
X/FP0R
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