Modbus Slave Communication - IDEC FT1A Series User Manual

11: M C
ODBUS OMMUNICATION

Modbus Slave Communication

Modbus slave communication can be configured by selecting Modbus RTU Slave for port 2 and port 3 in the WindLDR Function
Area Settings. When a Modbus slave receives a request from the Modbus master, the Modbus slave reads or writes data according
to the request. The request is processed at the END processing of the user program.
Modbus slaves do not reply to the Modbus master for the broadcast requests.
Modbus Slave Communication Specifications
Item
Baud Rate (bps)
Data Bits
Stop bits
Parity
Slave Number
Timeout between Characters
Timeout between Frames
*1: When timeout occurs, the SmartAXIS discards the received data and waits for the first frame of the next valid communication.
*2: For communication at 19200bps or higher, the timeout between characters needs to be a minimum of 0.75ms.
*3: For communication at 19200bps or higher, the timeout between frames needs to be a minimum of 1.75ms.
11-8
*1
*1
S AXIS P
MART
9600, 19200, 38400, 57600, 115200
8 bits (fixed)
1, 2 bits
Odd, even, none
Constant 1 to 247
Data register The value in D8027 (port 2) or D8028 (port 3) is used
*2
1.5 characters minimum
*3
3.5 characters minimum
/L U ' M FT9Y-B1378
RO ITE SER S ANUAL
Description