The compact modular structure of the EX250/500 is designed for easy installation . Diagnostic LEDs are immediately visible, and components can be readily removed and replaced .

CONTROLLER UNIT

The only difference between the EX250 controller and the EX500 controller is the CPU card . The controller unit consists of-

CPU which contains 1 . CPU Card.

2. Power Supply Card .

3. Space for Optional Computer Interface Card

Backplane which contains space for 8 I/O Modules

DIAGNOSTIC LEDs (RUN, CPU, I/O, PROG, POWER, BATT, COMM, HOLD)

Controller CPU

Cable connector to expansion unit

RUN/HALT selector switch

Cable connector for

Programmers

I/O status LEDs

EXPANSION UNIT

The expansion unit consists of a backplane and space for additional I/O modules .

Cable connector to controller unit

+5 V power supply from controller unit

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Toshiba EX250, EX500 manual Controller Unit