ABB CPM810 Redundant high-speed communication bus

Description

The memory is made up of two megabytes of flash ROM, eight

megabytes of SDRAM, and 512 kilobytes of NVRAM.

The flash ROM memory holds the operating system instruc

tions for the microprocessor. The SDRAM memory provides

temporary storage and a copy of the system configuration. The

NVRAM memory holds the system configuration

(control strategy designed with FCs) and files for

C applications. NVRAM memory retains whatever information

it has, even when it loses power.

The direct memory access (DMA) section enables the various

communication links to perform direct data transfers to and

from RAM memory without processor intervention. Communi

cation links that support DMA are the I/O expander bus, the

dual redundancy link, and Controlway. ABB-designed chips

control DMA activity.

The DMA process greatly reduces the amount of work the

microprocessor needs to do when making data moves. This

greatly increases the speed of the controller by not overloading

the microprocessor with the work associated with data moves.

The microprocessor does not have to execute data moves and

is free to do other tasks.

Controlway

Controlway is a redundant, high speed communication bus

between Harmony rack controllers. The controller uses this

bus to communicate with other controllers within a Harmony

control unit. It provides a one-megabaud, peer-to-peer com

munication link that can support up to 32 devices. The Con

trolway interface is provided by a custom integrated circuit

that links the controller to the Controlway. It has full DMA

capabilities (allowing for quicker operation), and two indepen

dent, redundant channels.

The redundant Controlway channels run through two paths

on the MMU backplane circuit. The controller transmits and

receives data over both channels simultaneously. By receiving

data through two channels, the controller can check its integ

rity. In this way, Controlway minimizes the potential that a

failure on a circuit board or backplane will cause loss of con

troller communication.

The Controlway interface also allows the controller to run on

module bus by operating in an 83.3-kilobaud mode (switch

selectable). The module bus operation option is provided to

support existing INFI 90 OPEN and Network 90® systems. A

jumper allows the controller to be installed in systems using

early Network 90 MMUs that require -30 VDC. The jumper dis

connects -30 VDC on the Network 90 MMU from pin four of

connector P1 on the controller.

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