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