ProSoft Technology MVI56-BSAPS - Manual (Page 60)

MVI56-BSAPS ♦ ControlLogix Platform Reference
Bristol Babcock Serial Slave Module
Page 60 of 83 ProSoft Technology, Inc.
September 22, 2008
The following illustration shows the data transfer method used to move data
between the ControlLogix processor, the MVI56-BSAPS module, and the BSAP
network.
As shown in the diagram, all data transferred between the module and the
processor over the backplane is through the input and output images. Ladder
logic must be written in the ControlLogix processor to interface the input and
output image data with data defined in the controller tags. All data used by the
module is stored in its internal database.
MVI56-BSAPS Fixed Database Map
Start Address End Address Data
0 509 Input Analog Data
510 638 Input Logical Data
640 2740 Input String Data
3000 3509 Output Analog Data
3510 3638 Output Logical Data
3640 5740 Output String Data
Data contained in this database is paged through the input and output images by
coordination of the ControlLogix ladder logic and the MVI56-BSAPS module's
program. Up to 248 words of data can be transferred from the module to the
processor at a time. Up to 247 words of data per backplane scan can be
transferred from the processor to the module. Each image has a defined
structure depending on the data content and the function of the data transfer
described in the following topics.