Modbus TCP Introduction

Modbus TCP

Canvas supports Modbus TCP as a way to connect with other devices that support this protocol. Users can use Swap 16 on Integers, Strings, Float32, and Float64, Swap 32 on Integers, Float32, and Float64 or Swap 64 on Integers, Float32, and Float64. Users will also have to set the Unit Identifier for Modbus TCP to correctly identify the device to communicate with.

Format

• General Format: {Memory Area Symbol}{Address Number}
  • Memory Area Symbol: refer to the table below. This component is required.
    • For Coil memory areas, Memory Area Symbol 0, the leading 0 cannot be dropped.
  • Address Number: index of the memory area to access, represented in decimal notation.
    • Leading zeros are not required (i.e., 00025 is equivalent to 25).

Memory Area and Ranges

Memory Area	Symbol	Digital Tag	Analog Tag	Access
Coil	0	000001 - 029999	-	R/W
Input	1	100001 - 129999	-	R
Input Register	3	-	300001 - 329999	R
Holding Register	4	-	400001 - 429999	R/W