ABB 216MB66 HESG324511M1 Equipment Rack

ABB 216MB66 HESG324511M1 Equipment Rack

Functional Description

The 216MB66 equipment rack installed in the hinged frame of a protection cubicle. The electronic modules

are designed as plug-in units, which are inserted from the front. The B448C parallel bus provides

communication between the electronic units and is fitted to the rear of the rack. Also situated at the rear are

the connectors for the standard cables to the I/O units and for connecting a printer.

The input transformer, auxiliary relay I/O and tripping relay units are mounted on the inside of the rear panel

of the protection cubicle.

The number and type of electronic units installed, their locations in a rack, the number of racks and the

number and arrangement of I/O units varies from plant to plant.

Features

• Specification based on IEEE P 896 (future bus)

• Time multiplexing of addresses and data (16 bit)

• Asynchronous data transmission with handshake

• Integrity checking of each data exchange.

• Up to 32 master units having equal status, actively accessing the bus

• Common internal 24 V auxiliary supply for all electronic units; redundant 24 V are possible.

Technical Specifications