User`s manual

12
FX3U Series Programmable Controllers
User’s Manual - MODBUS Serial Communication Edition
2 Specifications
2.1 Communication Specifications
2. Specifications
This chapter explains the communication specifications and performance.
2.1 Communication Specifications
MODBUS Serial Communication can be implemented according to the specifications shown in the table
below with the corresponding special adapter attached to the PLC, either the FX
3U-232ADP-MB or FX3U-
485ADP-MB. The communication format, protocol, etc. are determined by the communication setup using a
sequence program, as described in Chapter 5.
Note
This table details the specifications when using MODBUS communication. The FX
3U-485ADP-MB and FX3U-
232ADP-MB also features FX
3U-485ADP and FX3U-232ADP functionality respectively. Therefore the
following communication types are also available when using the following modules:
For further information on the communication types and please refer to the FX Series Programmable
Controller User's Manual - Data Communication Edition.
Item
Specifications
Remarks
FX3U-232ADP-MB FX3U-485ADP-MB
Channels per PLC 1 Channel
Either 1 MODBUS Master or 1
MODBUS Slave channel
Transmission
Specifications
Communication Interface RS-232C RS-485
Transmission Speed
300, 600, 1200, 2400, 4800, 9600,
or 19200 bps
Data Length 7-bit or 8-bit
Stop Bit 1-bit or 2-bit
Transmission Distance Up to 15m (49’2") Up to 500m (1640’5")
Transmission Distance varies
depending on communication
equipment type
Communication Protocol RTU or ASCII
Master Function
Number of Slaves 1 Slave 16 Slaves
Number of Slaves varies
depending on communication
equipment type
Number of Functions 14 (+14 Diagnostic functions)
Number of Simultaneously
Executable Instructions
1 Instruction
Maximum Write Data 123 words or 1968 coils
Maximum Read Data 125 words or 2000 coils
Slave Function
Number of Functions 14 (+14 Diagnostic functions)
Number of Simultaneous
Acceptable Request
Messages
1 Request Message
Station Number 1 to 247
Special Adapter
External Dimensions 90 (H) x 17.6 (W) 74 (D) [mm]
Weight 80g
FX3U-485ADP
N:N network, Parallel link, Computer link, Non-protocol
communication and Inverter communication.
FX
3U-232ADP
Computer link, Non-protocol communication, Programming
communication and Remote maintenance.