PLC Revision

PLC I/O systems provides an interface between

• Input devices and the CPU

• Field equipment and the CPU

• Output modules and field devices

• Input modules and output modules

A _____ is usually mounted on the first end of each rack, backplane, or chassis.

• CPU

• single power supply

• memory card

• I/O card

A standard input module has:

• a. 10 input points

• b. 12 input points

• c. 16 input points

• d. Any of the above

Suppose you need to select a module to inter face out going AC or DC, two –state, ON/OFF, or OPEN/CLOSED outgoing signals. Which will you choose:

• b. analog output module

• a. discrete output module

• c. discrete input module

A counter instruction is a ______ instruction.

• input

• output

• retentive

Pulse Repetitive Timer means__________.

• a. timer which gives one pulse for each scan time

• b. timer which doesn’t have any preset value

• c. one delay timer

• d. OFF delay timer

HSC stands for _________

• High Sequence Counter

• High Standard Counter

• High Speed Counter

Suppose the greater than or equal instruction has the integer 19 stored in source A and the integer 23 stored in source B. is this output coil ______.

• turns On

• turns OFF

• remains in previous state

Proportional controller is also known as _________ controller.

• a. Ratio

• b. Reset

• c. Rate

• d. None

Integral controller is also known as _________controller.

• a. Ratio

• c. Rate

• b. Reset

• d. None