ProSoft Technology MVI56E-MNET/MNETXT - Manual (Page 118)

Reference MVI56E-MNET / MNETXT ♦ ControlLogix Platform
User Manual Modbus TCP/IP Interface Module
Page 118 of 181 ProSoft Technology, Inc.
April 23, 2014
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.