User`s manual

93
FX3U Series Programmable Controllers
User’s Manual - MODBUS Serial Communication Edition
9 Slave Specification
9.4 User defined MODBUS Device Address Assignment
1
Outline
2
Specifications
3
System Configuration
4
Wiring
5
Communication Setup
6
Related Devices and Comm. Status
7
MODBUS Standard Commands
8
Master Specification
9
Slave Specification
10
Creating Programs
The following tables provide the default values for MODBUS address allocation for Bit devices and word
devices for the example stated above:
Bit device:
Word device:
Coils (Read / Write) FX3U Device
0x0000 - 0x001F X0 - X37
0x0020 - 0x005F M128 - M191
Holding-Register (Read / Write) FX3U Device
0x0000 - 0x0007 TS0 - TS127