Rockwell Automation 2706-DXX Dataliner Message Display DL5 Series - Manual (Page 83)

2706-UM001A-US-P
Using the DL5 Parallel Port to Replace Pilot Lights 10-3
When the DL5 is placed in the round robin mode of operation, the DL5
begins by looking at the first data line D0. One of three events will occur
depending upon the condition of the data line and whether or not a message
is programmed:
•
If data line D0 is in an ON state, the DL5 will display message #1 (if
message #1 is programmed). Message #1 is the ON state message for
data line D0.
•
If data line D0 is in the OFF state, the DL5 will display message #17 (if
message #17 is programmed). Message #17 is the OFF state message for
data line D0.
•
If no message exists, the DL5 will ignore data line D0.
The DL5, will then look at the second data line, D1. One of three events
will occur depending upon the condition of the data line and whether or not
a message is programmed.
•
If data line D1 is in an ON state, the DL5 will display message #2 (if
message #2 is programmed). Message #2 is the ON state message for
data line D1.
•
If data line D1 is in the OFF state, the DL5 will display message #18 (if
message #18 is programmed). Message #18 is the OFF state message for
data line D1.
•
If no message exists, the DL5 ignores data line D1.
The DL5 then looks at the remainder of the data lines, D2 through D15.
After data line D15 is scanned, the DL5 will then start the sequence over
again beginning with data line D0. If only one data line is on, the display
will not clear before retriggering the message associated with that data line.
If no data lines are on, the display is cleared after the message wait time has
expired.
Note: If a data line is turned ON then OFF before the DL5 scans it, it will
not be remembered as being ON by the DL5. The DL5 will not look for
additional ON terminals until it is done executing a message it has
recognized as ON.