ProSoft Technology MVI56-AFC - Manual (Page 160)

MVI56-AFC Backplane Communication MVI56-AFC ♦ ControlLogix Platform
User Manual Liquid and Gas Flow Computer
Page 160 of 316 ProSoft Technology, Inc.
February 25, 2011
11.1 MVI56-AFC Module Data Transfer
11.1.1 Input/Output Blocks for Data Transfer
When you configure the MVI56-AFC module to the I/O configuration of your
ControlLogix controller, the tags of the Output Block Array (OBA) and the Input
Block Array (IBA) for the module are automatically created as controller tags by
the RSLogix5000 programming software.
Output Block Array
Size: 248 elements Data type: Integer (2 bytes)
The OBA is used for transferring process variables from individual meter runs
and other data that are available in the ControlLogix processor memory to your
AFC module via the backplane. This array is made up of a block of 248
contiguous integer elements.
Element Attribute
Local 3.O (slot number) Local.O.Data[0]
Local.O.Data[1]
Local.O.Data[2]
………………..
Local.O.Data[n]
………………..
Local.O.Data[247]
The meter run process variables such as temperature, pressure, differential
pressure, meter pulses, and so on. may come from other I/O modules in the rack
or from other sources like an HMI and so on. These variables must be copied to
predefined structured function blocks which transfer them to the AFC module as
part of one or more OBAs.