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Chapter 5
Run Mode
Special Messages
Message numbers 1-16 are special messages which provide a variety of
functions. Special messages are disabled by entering a regular message in
their place. Once a regular message is created, it must be erased to regain the
function of the special message.
For example, if a user message is stored as message 3, triggering message 3
no longer resets the DL20.
Note: Use Control E to erase a regular message.
Special Message #1: Clear Display
All lines of the DL20 are cleared when special message #1 is triggered. All
lines of any attached DL10 slave displays are also cleared.
Here is an example of using special message #1: fault messages need to be
displayed and remain displayed until the fault is cleared and some
acknowledgement is made by the machine operator. One way to do this is to
program fault messages as auto repeat messages. When the fault message is
triggered, it is displayed continuously. A fault cleared button on the machine
triggers special message #1 which clears the display. The display remains
clear until another message is sent.
Special Message #2: Clear Display and Queues
Special message #2 clears the display along with the message trigger and
variable data queues.
This message is useful when implementing priority messages. For example:
you might want to display routine progress prompts and have three or four
messages waiting to be displayed. Now let's say a fault happens. The fault
message is displayed after the other (presumably less urgent) messages ahead
of it in the message queue are displayed.
Triggering special message #2 prior to a fault message interrupts whatever
message is being displayed, cancels the display of any message triggers in
the queue and immediately displays the fault message. This allows the fault
message to be displayed immediately, no matter what the DL20 was doing
previously.
5–6
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