Deck 2: Understanding the Inputoutput Io Section

Question 1

List at least two I/O modules that require shielded cable to reduce the effects of electrical noise.

Answer 1

Certain I/O modules such as TTL, analog, and thermocouples require shielded cable to reduce the effects of electrical noise.

Question 2

List three things to consider before installing a rack or chassis.

Answer 2

Before installing a rack or chassis, consideration must be given to the following:
temperature
dust
vibration
humidity
field wiring distances
troubleshooting accessibility

Question 3

The ____________________ type output module is used when dry reed relays are desirable.

Answer 3

reed relay

Question 4

____________________ output modules are used for interfacing with discrete or integrated circuit (IC) TTL devices, LED displays, and various other 5 V DC devices.

Question 5

While it is important that the controller and programming unit be installed or mounted in a control center or other central location, the use of remote I/O racks allows the input and output modules to be installed close to the actual operating equipment.

Question 6

When an output module is connected positive and provides current to the outside world (output device), the module is referred to as ____________________.

Question 7

With solid-state control systems, proper ____________________ helps eliminate the effects of electromagnetic induction.

Question 8

PLCs with ____________________ I/O typically come in a complete unit that contains the processor, I/O section, and power supply.

Question 9

What is a Triac used for in an AC output module?

Question 10

Discrete I/O modules are types of modules that only accept digital or ON- and OFF-type signals.

Question 11

Describe electrical noise and how it is generated.

Question 12

Status lights are provided for each output point to indicate when that point has been turned OFF.

Question 13

The input/output section, or I/O section, is the major reason that PLCs are so versatile when used with process machines or driven equipment.

Question 14

The analog output module changes Binary or BCD values generated in the PLC logic into analog signals using an RTD.

Question 15

What is an I/O rack or chassis?