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A Tricon system must have a main chassis and may have up to14 expansion or remote expansion (RXM) chassis. The following configuration guidelines apply.

Main Chassis Configuration Guidelines

• There is one main chassis with a chassis address of 1.

• The main chassis must contain three model 3008 Main Processors for Tricon v9.6 and later systems.

• The main chassis must house two power modules.

• The main chassis provides six logical slots for user-selected modules and one COM slot.

• A v9 low-density configuration includes a v5–v8 chassis with v9 main processors, communication, and I/O modules.

Expansion Chassis Configuration Guidelines

• Expansion chassis are used when the total I/O bus cable length for the system is less than 100 feet (30 meters) for each channel.

• Each expansion chassis must have a unique address between 2 and 15. This address must not be used by any other chassis.

• Each expansion chassis must house two power modules.

• One set of triplicated I/O bus cables is used to interconnect channels A, B and C between expansion chassis.

• Each expansion chassis provides eight logical slots.