1a. With suitable diagrams describe the architecture of the 68HC12 microcontroller.
1b. With suitable diagrams, describe the structure of a PLC.
1c. Describe the advantages of the PLC over hardwiring.
1d. With suitable diagrams, describe the scan cycle of a PLC.
1e. Draw the PLC field-wiring diagram (input/output circuit diagram) for the timed sequential starting
of two three-phase induction motors used to power the cooling water pump and cutting tool of a lathe
or milling machine.
1f. Draw the motor power diagram.
1g. Draw the PLC field-wiring diagram (input/output circuit diagram) for forward and reverse control
of a three-phase induction motor with direction indicator lights.
1h. Explain the operation of an on-delay timer with retention.
li. Explain the terms label, opcode and operand, immediate, direct and indirect addressing with respect
to the 68HC12 microprocessor.