Ibm Modbus Plus Manuel d'utilisateur télécharger pdf (Page 14)

Modbus Plus X-Link Driver User’s Guide

4.1 Data Types and Lengths

The Modbus Plus Driver supports three X-Link data formats; Bits and

Integers, as well as Floats.

The Modbus Plus protocol does not support floating point. The driver will

truncate any floating point numbers before transmission, and expand the

integer numbers to floating point after retrieval when floating points are

requested.

The type of Modbus Plus command that the driver generates depends on the

address type specified.

The length of the data portion in a command is constrained by the Modbus

Plus protocol. Mappings that are configured with the X-Link reading or

writing the data on the Modbus Plus network should be restricted to a

maximum size of:

Data Type X-Link Access Maximum Size (bytes)

COIL Read 250

COIL Write 100

Registers Read 250

Registers Write 200

Global Data Read/Write 64

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Ibm Modbus Plus Manuel d'utilisateur Page 14