EP Series User Manual
17
The MODBUS protocol allows easy communication in all types of network
architectures.
Figure 3-2 Modbus communication
A. Function code supported by Modbus/TCP
EP series drivers currently support the following Modbus function codes:
a. 0x03: Read Holding Registers
b. 0x06: Write Single Register
c. 0x10: Write Multiple Registers
B. Modbus/TCP register
a. Register address description
The MODBUS register starts with 0, while in the touch screen and PLC, the
address of the register is usually expressed as 400x type, starting with 1. So: PLC
address = MODBUS address + 1.
b. Register operation type
R-Read-only
W-Write-only
R/W-Read/Write
c. Data type
MODBUS defaults a register to 16 bits. Two consecutive registers Form a 32-bit
data, the lower 16 bits are first, and the higher 16 bits are last.
SHORT —— 16bit
LONG —— 32bit
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