Operating Special Screen Objects
5-4
MP270 Equipment Manual
Release 01/99
5.2 Messages
Message categories
Messages on the MP270 indicate events and statuses related to control
processes. A message can contain text and tags. Parts of the text can be
configured to flash or be underlined to distinguish it from other parts of the text.
The MP270 displays the following types of message:
Event messages
indicate normal operating and process statuses and process progress, e.g.
– Motor on
– PLC in manual mode
– Operating temperature xx reached
Alarm messages
indicate critical or dangerous operating or process statuses and require a
response in the form of an acknowledgment.
Examples of alarm messages:
– Motor temperature too high
– Coolant empty
– Valve will not open
System messages
indicate statuses and faults in the MP270 and PLC or communication between
them. They are triggered by the MP270 or PLC.
Examples of system messages are provided in Appendix C.
Message events
Messages are controlled by events and are triggered when a bit is set in the PLC.
The MP270 establishes the following message events and assigns them a time
stamp:
Arrived
time at which a message was triggered by the PLC or MP270.
Departed
time at which a message was withdrawn by the PLC.
Acknowledged (alarm messages only)
time at which an alarm message was acknowledged by the MP270 or PLC. The
acknowledgement confirms that the alarm message has been noted.
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