Application Layer Message Formats; Overview - Honeywell UMC800 Reference Manual

4. Application Layer Message Formats

4.1 Overview

Introduction
This section describes the overall format of the request and response messages for the application layer.
Refer to subsection 2.9 for an anatomy of a message format.
Available Messages
Below are listed the available message requests that are available in this application:
•
Read Contiguous 32-bit Values
•
Read Scattered 32-bit Values
•
Write Scattered 32-bit Values
•
Loopback
Block Parameters
The location or address for data in the UMC800 controller consists of a Table Type, a Block Number, and
an Index Number.
Table Type
Block Number identifies a given function block entered in the Function Block Diagram (FBD)
Index Number identifies a particular parameter in a given block type that is accessible for
Variables
Note that a block number (251) has indices that have been assigned automatically for variables entered in
the Function Block Diagram configuration. Refer to subsection 5.77. The index number assignments for
variables can be printed out from the LeaderLine Control Builder.
In this section
These major topics are covered in this section.
4.2 Read Contiguous 32-Bit Values
4.3 Read Scattered 32-Bit Values
4.4 Write Scattered 32-Bit Values
4.5 Loopback
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identifies whether it's a Dynamic (I/O) parameters or Static (configuration) parameters.
configuration with a unique assigned number between 1 and 250. The block number
assignment can be printed out from the LeaderLine Control Builder.
communication purposes. This index information is available from the tables in
Section 5 - Function Parameter Index Reference.
Topic
RS232 Communications Reference Manual
Message Exchange Formats
See Page
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