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AVEVA™ Adapter for Modbus TCP

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Data types

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  • Last UpdatedAug 21, 2026
  • 2 minute read

The adapter converts readings from single or multiple registers into the data types specified by the data type code and populates the value into streams.

The following table lists all data types with their corresponding type codes supported by the adapter.

Data type code

Data type name

Value type

Register type

Description

1

Boolean

Boolean

Bool

0 = false
1 = true

10

Int16

Int16

Any

Read 1 Modbus TCP register1 and interpret as a 16-bit integer. Bytes [BA] read from the device are stored as [AB].2

20

UInt16

UInt16

Any

Read 1 Modbus TCP register1 and interpret as an unsigned 16-bit integer. Bytes [BA] read from the device are stored as [AB].2

30

Int32

Int32

Holding16/Input16

Read 32 bits from the Modbus TCP device and interpret as a 32-bit integer. Bytes [DCBA] read from the device are stored as [ABCD].2

31

Int32ByteSwap

Int32

Holding16/Input16

Read 32 bits from the Modbus TCP device and interpret as a 32-bit integer. Bytes [BADC] read from the device are stored as [ABCD].2

40

UInt32

UInt32

Holding16/Input16

Read 32 bits from the Modbus TCP device and interpret as a 32-bit unsigned integer. Bytes [DCBA] read from the device are stored as [ABCD].2

41

UInt32ByteSwap

UInt32

Holding16/Input16

Read 32 bits from the Modbus TCP device and interpret as a 32-bit unsigned integer. Bytes [BADC] read from the device are stored as [ABCD].2

100

Float32

Float32

Holding16/Input16

Read 32 bits from the Modbus TCP device and interpret as a 32-bit float. Bytes [DCBA] read from the device are stored as [ABCD].2

101

Float32ByteSwap

Float32

Holding16/Input16

Read 32 bits from the Modbus TCP device and interpret as a 32-bit float. Bytes [BADC] read from the device are stored as [ABCD].2

110

Float64

Float64

Holding16/Input16

Read 64 bits from the Modbus TCP device and interpret as a 64-bit float. Bytes [HGFEDCBA] read from the device are stored as [ABCDEFGH].2

111

Float64ByteSwap

Float64

Holding16/Input16

Read 64 bits from the Modbus TCP device and interpret as a 64-bit float. Bytes [BADCFEHG] read from the device are stored as [ABCDEFGH].2

1001 - 1250

String

String

Holding16/Input16

1001 reads a one-character string, 1002 reads a two-character string, and 1003 reads a three-character string and so on. Bytes [AB] are interpreted as "AB".

2001 - 2250

StringByteSwap

String

Holding16/Input16

2001 reads a one-character string, 2002 reads a two-character string, and 2003 reads a three-character string and so on. Bytes [BA] are interpreted as "AB".

1 For more information about Modbus TCP registers, see How is data stored in Standard Modbus? (https://www.se.com/us/en/faqs/FA168406/)

2 Bytes are read in reverse order.