ProSoft Technology MVI56E-MNET/MNETXT - Manual (Page 117)

MVI56E-MNET / MNETXT ♦ ControlLogix Platform Reference
Modbus TCP/IP Interface Module User Manual
ProSoft Technology, Inc. Page 117 of 181
April 23, 2014
Select Priority Read Block (Write Block Offset 247)
Note: The Select Priority Read Block feature is only available for firmware versions 1.36.000 and
newer.
This register allows the processor to select which read blocks will be returned
from the module. If this register equals zero, the module will return all read blocks
in sequential order.
If this register has a non-zero value, the module will return the read block
selected, and the following one.
This feature can be used for applications that require some read blocks to be
updated more frequently than other blocks.
The following illustrations show the effect of changing the value of the Select
Priority Read Block register (Write Block offset 247). In the following histogram
curve, the Select Priority Read Block is equal to 0.
 Local:1.O.Data[247] = Select Priority Read Block.
 Local:1.I.Data[249] = Read Block ID.
In the example above, all read blocks (1 to 10) are returned in sequential order.