Panasonic FP7 Series User Manual

Operan
d
16-Bit device:
32-Bit
device:
Integer
Real
numbe
r
St
rin
g
Index
modifie
r
W
X
W
Y
W
R
W
L
W
S
S
D
D
T
L
D
U
M
WI
W
O
TS
C
S
TE
C
E
IX K Ｕ H SF
D
F
" "
D1 ● ● ● ● ● ● ●
D2 ● ● ● ● ● ● ●
(Note 1) Only in the case of "direct address specification" (main instruction) in the MODBUS mode, an integer
can be specified for the sender address.
■
Available bit devices (●: Available)
Operand
Bit device
Specification of bit of
word device
Index modifier
X Y R L T C P E
S
R
IN
O
T
DT.n LD.n
S1
S2 ● ● ● ● ● ● ●
n
D1 ● ● ● ● ● ● ●
D2
■
Outline of operation
● The MODBUS command is sent from the communication port of the unit to send/receive data
to/from external devices.
● Data can be read and written by specifying station numbers and memory addresses and
executing the SEND and RECV instructions in a user program, because PLC automatically
creates messages according to the protocol.
● Specify the MODBUS command and the partner MODBUS address in a Hex format in [S1].
● When the RECV instruction is executed, data are read from the address starting with [S2] in
the partner unit, and stored in the area starting with [D1] in the master unit.
● The transfer method (register transfer/bit transfer) and the MODBUS function code that can
be used vary, depending on the type of device specified by [D1].
● The amount of received data [n] is specified in words for the register transfer, and in the
number of bits for the bit transfer.
● The execution result code is stored in the one-word area of the master unit that is specified
by [D2].
■
Specification of [S1] and [n]
● Operand [S1] is specified as a combination of a two-digit hexadecimal MODBUS function
code and a two-digit hexadecimal partner station number.
Example: Specify "H030F" in the case of MODBUS function code 03 (read holding registers)
and station number 15.
● The transfer method and the MODBUS function code that can be used vary, depending on
the type of device specified by the operand [D1].
8.3 MODBUS RTU Master Communication (RECV)
WUME-FP7COM-07 8-15

Panasonic FP7 Series Specifications

General

Brand	Panasonic
Model	FP7 Series
Category	Controller
Language	English