IDIS 400

Define the term analog

a rang of values (non discrete)

Contacts wired in parallel have what relationship?

OR

Briefly describe the EXAMINE ON instruction.

examines a value of another location and returns the input value as is. True --> True

Draw an AC output module with four devices

figure 2-16 pg. 24

List the two types or styles of programming devices

handheld or PC

define word

two bytes or 16 bits

what is the function of the LED within the optical isolator?

indicates to the photo transistor that the system is active. This sends the ON signal to the PLC system.

what is the function of the diodes within the AC and DC discrete input module?

insure that the current only flows one way. also status light.

state two reasons for employing optical isolation

isolate high voltages reduces noise

Define the terms normally open and normally closed

normally open - off when de-energized normally closed - on when de-energized

How do we prevent binary numbers 10 and 11 from being confused as decimal numbers?

parenthesis and subscripts (10)_2 and (11)_2

Explain what "+" and "-" represent

positive and negative inputs in a DC circuit

The two main vertical lines of a ladder diagram are often referred to as:

rails

Define Interface

converts input signal to output signal voltage drop from 24 or 110 to 5 V

The hexadecimal value 2CB is not which of the following a. 715 decimal b. 1313 octal c. 0010 1100 1011 binary d. 0111 0001 0011 BCD

d. 0111 0001 0011 BCD

what are the function of R1 and R2 in an AC Discrete Input module?

reduces the input voltage

The horizontal lines of a ladder diagram are often referred to as:

rungs

Explain why there is no filter network

the system is already input as DC

List the Four Main components of a PLC.

1. Input module 2. output module 3. cpu 4. memory

Convert decimal number 359 to a binary number.

101100111

1K of memory is actually: How many words?

1024 words

Convert binary number 11011011 to a decimal number.

219

Convert decimal number 232 to an octal number.

350

Convert hexadecimal number 14CD to a decimal number.

5325

define byte.

8 bits.

Contacts wired in series have what relationship?

AND

what are the function of R1 and R2 in an DC Discrete Input module?

reduce the input voltage

when information is stored using only 1s and 0s, it is called a _______ system.

Binary

A bit is an acronym for a ________

Binary Digit

The decimal numbering system uses 10 digits, or a base of 10. List the base for each of the following numbering systems. Binary: Hexidecimal: Octal:

Binary: 2 Hexidecimal: 16 Octal:8

The processor is often referred to as the __________ of the programmable controller.

Brain

Convert decimal number 3247 to a hexadecimal number.

CAF

How are contacts that are associated with relays, motor starters timers and the like identified?

CR1, M2, T1.DN, etc.

What is the function of a Bridge Rectifier?

Converts AC input voltage to DC

Explain the following initials: DC ADC AC CPU DAC PC PLC NEMA I/O

DC - Direct Current ADC - Analog to Digital Converter AC - Alternating Current CPU - Central Processing Unit DAC - Digital to Analog Converter PC - Personal Computer PLC - Programmable Logic Controller NEMA - National Electrical Manufacturers Association I/O - Input/Output

The XIC instruction is the same as: a. EXAMINE ON b. EXAMINE OFF

EXAMINE OFF

The XIO instruction is the same as: a. EXAMINE ON b. EXAMINE OFF

EXAMINE ON

E-stop refers to:

Emergency - Stop

Identify the following PLC-5 Files I O N S B T R F C

I - Input O - Output N - Integer S - Status B - Bit T - Time R - Control F - Floating Point C - Counter

Describe the purpose of the I/O section

Input/Output Input: converts input signals to PLC levels Output: converts PLC levels to output signals

Briefly describe why a hardwired emergency-stop circuit is recommended for PLC installations.

It allows power to be cut from the whole system, bringing everything to a stop to prevent harm to the system or to people.

Explain what L1 and L2 represent.

L1 is the input power source in an AC circuit L2 is the ground point in an AC circuit

Define Discrete

Only has two options. -On/Off -True/False no inbetween

Devices that are intended to perform a START function are normally wired in ______ with each other.

Parallel

Devices that are intended to perform a STOP function are normally wired in ______ with each other.

Series

Briefly describe volatile memory.

System loses info when power turns off.

Briefly describe non-volatile memory.

System retains info when power turns off.

True or False RELAY LADDER LOGIC is a high level graphic computer language.

True

What is a major advantage of a PLC system over the traditional hardwired control system?

When you want to change system functionality, you do not have to rewire, you only reprogram.

what is the function of the photo transistor within the optical isolator?

picks up the LED and sends the ON signal to the PLC system

Convert the following 8-bit signed #'s to decimal. a. 1111 0110 b. 0111 0110 c. 1111 1001 d. 0111 1001

a. -10 b. +118 c. -7 d. +121

Express the following signed decimal numbers in 2s complement. Use 8-bit words. a. (-)7 b. (-)4 c. (-)3

a. 1111 1001 b. 1111 1100 c. 1111 1101

Convert the following binary values to decimal. a. 10011000 b. 01100101 c. 10011001 d. 00010101

a. 152 b. 101 c. 153 d. 21

Convert the following BCD values to decimal. a. 1001 1000 b. 0110 0101 c. 1001 1001 d. 0001 0101

a. 98 b. 65 c. 99 d. 15

If the N.O. limit switch in Question 2 is programmed using an N.C. contact symbol (EXAMINE OFF), the instruction will be true when?

as long as the limit switch is open

define the term scope tags.

availability of a tag to the user programs.

The BCD value 1001 0011 0101 is not which of the following? a. 935 decimal b. 0011 1010 0111 binary c. 647 octal d. 3A7 hexadecimal

c. 647 octal

Define Real World

components outside the PLC i.e. switches, buttons, etc.

What is the function of a filter network in an AC Discrete Input module?

condition the DC and guard against electrical noise.

Briefly describe the action of the EXAMINE OFF instruction.

examines a value of another location and returns the opposite value. True --> False

Draw an AC input module with four devices.

figure 2-11 pg. 19

Explain why a DC discrete input module does not have a bridge rectifier?

the system is already running DC. No need for conversion.

When an N.O. limit switch is wired to an input module, and programmed using an N.O. contact symbol (EXAMINE ON), the instruction will be true when?

when the limit switch is closed

Describe the diference between a wiring diagram and a ladder (schematic) diagram.

wiring: physical location ladder: relative location for easy reading