Panasonic FP7 CPU Unit, User Manual

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6.2 List of MODBUS TCP Supported Commands
6.2 List of MODBUS TCP Supported Commands
6.2.1 List of MODBUS Function Codes

Table of supported commands
Code Name (MODBUS) Name
Remarks
(Reference no.)
FP7 supported
functions
01 Read Coil Status Read Y and R Coils 0X ●
02 Read Input Status Read X Input 1X ●
03 Read Holding Registers Read DT 4X ●
04 Read Input Registers Read WL and LD 3X ●
05 Force Single Coil Write Single Y and R 0X ●
06 Preset Single Register Write DT 1 Word 4X ●
08 Diagnostics Loopback Test - -
15 Force Multiple Coils Write Multiple Y's and R's 0X ●
16 Preset Multiple Registers Write DT Multiple Words 4X ●
22 Mask Write 4X Register Write DT Mask 4X -
23 Read/Write 4X Registers Read/Write DT 4X -
(Note 1) Types of MODBUS function codes vary by commands to be used.

Table for MODBUS reference No. and device No.
MODBUS reference no. Data on BUS
(hexadecimal)
PLC device number
Coil
000001-002048 0000-07FF Y0-Y127F
002049-034816 0800-87FF R0-R2047F
Input 100001-108192 0000-1FFF X0-X511F
Holding register 400001-465536 0000-FFFF DT0-DT65535
Input register
300001-301024 0000-03FF WL0-WL1023
302001-318384 07D0-47CF LD0-LD16383
(Note 1) The table above indicates correspondence between the MODBUS reference numbers for accessing from a
higher device to FP7 using the MODBUS protocol, and the operation device numbers of FP7.
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