Knowledge Base / Rockwell In-chassis / Programmable Modules

How do I transfer data from a PLC5 Processor and the MVI71-ADM module using Block Transfers?

Search KB


The transfer of data between the PLC5 processor and the MVI71-ADM can be made in two ways: using block transfers or using the side connector. In this application note we will discuss the way to do the block transfers.

The MVI71-ADM can not use input and output images, it needs to communicate using block transfers. Basically you will put in the ladder logic one BTR and one BTW instructions interlocked so only one is executed at a given time.

In the C program you will put one MVIBP_receive message function and one MVIBP_sendmessage function in the main program loop so both are executed synchronized with the ladder logic.

<="" ladder="">



<="" ladder="">