Rockwell Automation 2706-MB1 MESSAGEVIEW 421 SOFTWARE MANUAL - Manual (Page 52)

4–4 Planning an Application
Publication 2706-817
5. The application designer can validate an application at any time,
using the Validate command on the Application menu.
Incompatibilities are caught during validation. See Page 11–2.
Note: An application is automatically validated by
MessageBuilder software before it is downloaded to a terminal.
6. The designer or operator can monitor how the application is
running. Messages that have their HE Stack attribute set are
logged into the Historical Event Stack file each time they are
triggered. These logged messages include the value of their
display variables at the instant of triggering, and the current date
and time. The HE Stack file is uploaded to the computer on
request.
A MessageView terminal has memory reserved for an application
with up to 4096 standard messages. Messages are triggered
individually by the Logic Controller or ASCII Triggering device as
required by the interaction between:
•
the MessageBuilder application, and
•
feedback from the machinery to the Logic Controller or ASCII
Triggering Device.
The content of a message is determined by:
•
the MessageBuilder application
•
information transferred between the MessageView terminal and
its controller.
Each message has a unique number, which is used to identify it in the
application. Numbers in the range:
•
1 to 9900 are used for application messages
•
9901 to 9999 are reserved for Special Messages
•
greater than 9999 are not supported by the MessageView
terminal.
A message’s number is its value trigger. A message may also have a
bit trigger assigned to it. To trigger a specific message in the terminal
display, assert its corresponding bit or value trigger at the proper
location in controller memory. See the section on Triggering on
Page 4–9.
Messages