User`s manual

85
FX3U Series Programmable Controllers
User’s Manual - MODBUS Serial Communication Edition
9 Slave Specification
9.2 MODBUS device address allocation
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
9.2 MODBUS device address allocation
The following information details device allocation when using default values and how to create user defined
device address allocation values.
9.3 MODBUS device address allocation (Default Values)
The following table provides the default values for MODBUS address allocation for Bit devices and word
devices.
Bit device:
0x0B
Get Communication Event
Counter
Read communication event counter
0x0C
Get Communication Event
Log
Read communication event log
0x0F Write Multiple Coils Write multiple binary (R/W) devices
0x10 Write Multiple Registers Write multiple 16 bit (R/W) registers
0x11 Report Slave ID
Slave ID details:
- PLC run/stop state
RUN Status: RUN = FFH
STOP = 00H
- Slave ID F3H (FX
3U - same as
computer link)
Note: No additional data is supported
0x16 Mask Write Register
Manipulate slave register with AND Mask / OR
Mask
0x17
Read/Write Multiple
Registers
Read/Write multiple 16 bit (R/W) registers
MODBUS Binary Device Address
FX3U Device
Discrete Inputs (Read Only) Coils (Read / Write)
0x0000-0x1DFF 0x0000-0x1DFF M0-M7679
0x1E00-0x1FFF 0x1E00-0x1FFF M8000-M8511
0x2000-0x2FFF 0x2000-0x2FFF S0-S4095
0x3000-0x31FF 0x3000-0x31FF TS0-TS511
0x3200-0x32FF 0x3200-0x32FF CS0-CS255
0x3300-0x33FF 0x3300-0x33FF Y0-Y377
0x3400-0x34FF - X0-X377
Command Code
Subcommand
Code
Command Name Details