CI520V1 3BSE012869R1 | ABB | Interface Module

CI520V1 3BSE012869R1 | ABB | Interface Module Description:

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CI520V1 3BSE012869R1 | ABB |  Interface Module

CI520V1 3BSE012869R1 | ABB |  Interface Module

CI520V1 3BSE012869R1 | ABB |  Interface Module

DMA SECTION
The microprocessor sets this section for direct memory access
or DMA. The DMA section allows data being received or transmitted
over the various communication paths to be transferred
directly to or from the RAM memory without microprocessor
intervention. This process is known as cycle stealing. It greatly
reduces the overhead associated with the microprocessor doing
such data moves. This circuitry is used for the higher speed
communication paths where the microprocessor would be
overloaded handling the data moves, specifically Controlway.
The 40-kilobaud station link and the redundancy link also use
this feature.
CONTROLWAY
The Controlway is the high-speed version of the module bus. It
provides a one-megabaud peer-to-peer communication link
capable of supporting up to 32 connections. The Controlway
interface is provided by a custom Elsag Bailey integrated circuit
that links the MFP module to the Controlway. It has full
DMA capabilities (allowing for quicker operation), and two
redundant, independent communication channels. 

There are two separate communication paths on the module
mounting unit backplane circuit allotted for Controlway communications.
Data is transmitted over both channels simultaneously
and received in separate receivers where it is checked
for integrity. In this way, the Controlway minimizes the
chances that a failure on a circuit board, or the backplane will
cause loss of module communication.
As point data between intelligent modules travels on the bus,
the MFP module does a bit-by-bit comparison. The Controlway
interface also allows the MFP module to operate on the module
bus by operating in an 83.3 kilobaud mode.

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