ProSoft Technology MVI56E-SIE - Manual (Page 141)

MVI56E-SIE ♦ ControlLogix Platform Reference
Client Communication Module User Manual
ProSoft Technology, Inc. Page 141 of 168
September 6, 2012
In the example above, all read blocks (1 to 10) are returned in sequential order.
Select Priority Read Block = 5
If the ladder logic changes the value of Local:1:O.Data[247] from 0 to 5, note that
the Local:1:I.Data[249] value begins to alternate between Block IDs 5 and 6 as
long as Local:1:I.Data[247] stays set to 5.
5-6-5-6-5-6-5-6-5-6-
…
Select Priority Read Block = 0
After the ladder logic changes the value of Local:1:O.Data[247] from 5 to 0, then
the Local:1:I.Data[249] value is updated as before, by returning all blocks 1
through 10 in a repeating sequence.