Rockwell Automation 2706-DXX Dataliner Message Display DL5 Series - Manual (Page 80)

2706-UM001A-US-P
9-8 Using the Variable Data Feature
3. The DL5 will then display the message:
4. The controller then transmits a new variable “2040”.
5. The DL5 will then display the message with the new variable data:
6. To enter and display a different message with embedded variable data,
the controller must first trigger a programmed blank message to stop
display of the variable message.
7. The controller can now send the variable for the new message.
8. The controller can then send the message number for the new message
Updating a Variable Frequently – If your application requires that the
variable data within a message be updated frequently, you should program
the message with the following attributes:
•
A wait time of zero.
•
The auto clear function is not selected.
These message attribute settings will make it possible to update variable
data at the fastest rate (once every 220 milliseconds). This assumes a
normal sequence of events to enter variables and message numbers:
•
Send a variable. (110 milliseconds)
•
Send a message number. (110 milliseconds)
•
Send a variable. (110 milliseconds)
•
Send a message number, etc. (110 milliseconds)
Note: PLC program scan time must be added to the 110 millisecond data
hold time in the PLC program to assure that data is on the DL5 parallel port
for 110 milliseconds.
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