ABB CPU86-10MHZ+S100M Monitoring redundant controllers

Description

he I/O expander bus interface is implemented using an

ABB-designed integrated circuit. The microprocessor can

select one of two modes of operation: DMA or auto mode. The

controller software selects the mode of operation. Mode selec

tion is based on optimizing the number of bytes to be trans

ferred. In either mode of operation, the microprocessor does

not need to wait for each byte to transfer (as in previous con

trollers).

The controller connects to the I/O expander bus through the

P2 connector on the MMU backplane. It is an eight-bit parallel

bus that provides the communication path for I/O data from

Harmony rack I/O controllers. The I/O expander bus supports

up to 64 low power rack I/O devices.

I/O Section

The I/O section interface allows the microprocessor to read the

switches that tell it how to operate and set the controller

address. This section also contains latches whose outputs

connect to the status and error LEDs. This section monitors

redundant controllers and outputs a signal to the controller

active LED on the NTMP01. Upon failover, this output de-ener

gizes and the output of the redundant controller energizes its

controller active LED on the NTMP01 as it takes over. Addi

tionally, the I/O section monitors the stop/reset pushbutton.

When the pushbutton is pressed, the I/O section insures that

the controller completes any I/O functions before it stops the

controller.

Serial Channels

Two independent serial channels (RS-485) are available on the

controller. Both serial channels are dedicated for language

support (C). Clear to send (CTS) and request to send (RTS)

handshake signals are supported. A DUART circuit on the

controller supplies the serial channels with handshaking sig

nals. Clock signals for the baud rate generator are derived

from an onboard, 7.3728-megahertz oscillator.

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