Appendix G MSG-SND/MSG-RCV Functions (Ethernet)
G.2 Message Receive Function (MSG-RCV)
A-107
( 7 ) Data Address (PARAM05)
A data address requested from the transmission side is output.
However, when reading/writing multiple holding registers (function code: 17H), enter a start M register number for the
address table. The four words of addresses at the beginning of the M register set by PARAM05 (data address) are used
as an address table. In this address table, read address, read size, write address, and write size requested from the trans-
mission side are output.
For more information about the address table, refer to G.1.6 Function Setting and Parameter Details for MODBUS/
TCP Protocol.
( 8 ) Data Size (PARAM06)
The read/write data size (number of bits or words) requested from the transmission side is output.
( 9 ) Remote CPU Number (PARAM07)
Refer to G.2.8 Relationship between Data Address, Data Size, and Offset for MSG-RCV Function.
( 10 ) Offset (PARAM08 to PARAM11)
Specify an offset address for the reception side data address.
The address for the reception side will be displaced by the number of words designated by the offset.
Note: 1. For more information, refer to G.2.8 Relationship between Data Address, Data Size, and Offset for
MSG-RCV Function.
2. The offset cannot be a negative value.
The offset parameter is prepared for each target data type.
The following table lists the offset parameters.
The valid offset parameter may differ according to the function code.
The following table lists the valid parameters for each function code.
Table G.29 Offset Parameter List
Parameter Contents Description
PARAM08 Coil offset Sets the coil’s offset word address.
PARAM09 Input relay offset Sets the offset word address of an input relay.
PARAM10 Input register offset Sets the offset word address of an input register.
PARAM11 Holding register offset Sets the offset word address of a holding register.
Table G.30 Valid Parameter List for Offset of Each Function Code
Function Code Function
Valid Offset
Parameter
01H Reads coil state
PARAM08
02H Reads input relay state
PARAM09
03H Reads holding register content
PARAM11
04H Reads input register content
PARAM10
05H Changes single coil state
PARAM08
06H Writes to single holding register
PARAM11
0FH Changes multiple coil states
PARAM08
10H Writes to multiple holding registers
PARAM11
16H Mask writes to holding register
PARAM11
17H Reads/Writes multiple holding registers
PARAM11
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