Table of Contents
Advertisement
5-10
MicroLogix 1500 Ladder Example Program
Using Explicit Messaging
This section provides information and examples that explain how to use
Explicit Messaging to monitor and configure the 1769-SM1 and
connected drive(s).
Explicit messaging with the 1769-SM1 is supported only by the
MicroLogix 1500 LRP processor and RSLogix 500 (version 6.1 or
higher).
Important: The MicroLogix 1500 LRP processor supports messaging
ATTENTION: Hazard of injury or equipment damage exists. The
examples in this publication are intended solely for purposes of
!
example. There are many variables and requirements with any
application. Rockwell Automation does not assume responsibility or
liability (to include intellectual property liability) for actual use of the
examples shown in this publication.
ATTENTION: Hazard of equipment damage exists. If Explicit
Messages are programmed to write parameter data to Non-Volatile
!
Storage (NVS) frequently, the NVS will quickly exceed its life cycle
and cause the drive to malfunction. Do not create a program that
frequently uses Explicit Messages to write parameter data to NVS.
Datalinks do not write to NVS and should be used for frequently
changed parameters.
About Explicit Messaging
Explicit Messaging is used to transfer data that does not require
continuous updates. With Explicit Messaging, you can configure and
monitor a drive's parameters in the controller's ladder program.
Formatting Explicit Messages
Each message must be formatted as shown in
Table 5.A
TIP: A message file must be created for use by the message
instructions. Create a new data file having type = Message, and
containing at least one element for each message instruction in the ladder
program.
only for the first 2 I/O modules capable of messaging.
for a description of the data that is required in each box.
Figure
5.5. Refer to
Advertisement
Table of Contents
