PLCs 1, you want 'em we got 'em

2 / 98

Experience indicates that PLC processors account for _____ % of system failures, and the other control system components account for the remaining _____ %. As a result, initial troubleshooting should focus on the other system components.

O:4.0/5

For an AB PLC, select the address-based output address for a discrete actuator connected to point or terminal 5 of the output module in slot 4.

Bit

A PLC processor memory type with a Bool or a single binary data location is known as a ____

16 bit (*word)

A PLC processor memory type with an integer (INT) or a word with an upper and lower byte is known as _____

LEDs

Filed device status _____ and noting the movement of process actuators provide troubleshooting information without the need for measurement tools.

Contact / Coil

For PLC logic diagrams, all two-state (on/off) input instructions for input field devices use the _____ graphical symbols, and all two-state (on-off) output instructions for output field devices use the _____ graphical symbols.

more/ more

Mechanical switches fail ____ often that electronic switches, but both fail ____ often than PLC input modules.

Virtual / software

Mechanical timing relays and electronic timers are physical devices with physical contacts or solid-state switches that are hardwired into ladder rungs to control a machine or process. The PLC timer is a _____ timer created in the PLC program _____.

True

True or False: PLC control applications require a varying amount of PLC memory, and the control application dictates the processor model to use.

True

True or False: PLC ladder logic diagrams do not represent actual electrical circuits. The logic diagram represents a software logic (control function) flow only.

8 bit

A PLC Processor memory type with a small integer (SINT) or a byte is known as ___

Type 9

A PLC and related electrical switching hardware require a control panel enclosure for an indoor location in a hazardous location. The location exposes the enclosure to metal dust, flour, and grain dust. Determine the type of NEMA enclosure required.

32 bit

A double integer (DINT) or two words and REAL-type data with a whole number and decimal part is known as ____

immediately

A functioning PLC program is rarely the cause of a system failure. However, _______ after system instillations or modifications, wiring and program errors are suspect for possible operational problems.

Input / Multiple

A one-shot instruction makes the rung output true for one scan, independent of the state of the rung's ____ instruction, which may remain true for _____ scans.

software

PLC counters are _____ implementations of mechanical and electronic counters

a word

PLC memory stores data as a single or groups of binary bits called ______ .

0 and 5 V

Processors for PLC input and output signals use ___ and ____ V to communicate. Note devices tend to use greater voltage numbers.

1) AC inputs/outputs 2) DC inputs/outputs 3) Relay Outputs 4) Specialty modules

Removable terminal blocks (RTBs) are color coded to identify the types of signals present. What is the identification for each color: 1) Red 2) Blue 3) Orange 4) Green

Noise

Filters have two functions in a control panel: 1) to clean up signals entering the panel or 2) to prevent ____ from spreading within the panel.

0.34

For resolution, the analog input module only detects changes in the measured input greater than _____ micro Amps

Count-up

In general, a ____-____ application has three rungs: one for the counter instruction, a second rung for control of an output instruction using the counter done output bit, and a third rung with a reset instruction to reset the counter parameters.

Programmable Logic Controllers (PLCs)

_____ are special-purpose industrial computers designed for use in the control of a wide variety of manufacturing machines and systems

Analog / Analog to digital / Digital to analog

_____ input modules are needed to receive a range of values provided from a field device and can be run in either voltage mode or current loop. These have a(n) ? converter to change the measured production parameter from an analog voltage to a corresponding binary integer value, while output modules have a(n) ? converter to change the processor's binary integer output value to a corresponding analog voltage for the output actuator.

Trap / Rungs

_____ instructions/techniques are placed in program _____ to monitor the change in a bit or data value.

Module / Points

Address-based PLCs use the input and output ____ locations in the chassis and terminal wiring _____ for the signal address

64 bit

An ASCII character group or string is known as ____

EB3∨16

Convert the following 111010110011₂ to hexadecimal

1111 1011 1100 1010 0101₂

Convert the following FBCA5∨16 to binary

Micro and Nano

Machines with a limited number of I/O points and FEW signal types match the _____ control systems capability

Type 7

NEMA Hazardous Enclosure Codes: This enclosure is intended for use in locations classified as Class I, Groups A, B, C, or D, as defined by the NEC for indoor applications.

Type 8

NEMA Hazardous Enclosure Codes: This enclosure is intended for use in locations classified as Class I, Groups A, B, C, or D, as defined by the NEC for indoor/outdoor applications.

**Type 9

NEMA Hazardous Enclosure Codes: This enclosure is intended for use in locations classified as Class II, Groups A, B, C, or D, as defined by the NEC for indoor/outdoor applications for indoor applications.

RUN / REM / PROG

PLC processors have a key switch to put the plc into 3 different positions. 1) The ___ position allows program execution and scanning, but does not permit editing of programs. 2) The ____ position permits control of the operation modes from the programming software. Test modes for the processor. Permits online program edits of the executing program. 3) The ___ position stops input scanning, ladder rung execution, and output device change.

Address based, Tag Based, PC based

PLC program types include what 3 types?

3 / 3

PLC timers have ____ Boolean output bit(s) for each of the ____ timers (On-Delay, Off-Delay, Retentive). The timers are virtual timers created by the PLC program software.

1 & 2 = Input field device contacts; 3-5 = Output field device

PLCs contain two instructions. From the list, what field device would match each application: 1) Examine if Open (XIO) : (-]/[-) 2)Examine if Closed (XIC) : (-] [-) 3)Energized (-( )-) 4)Latch (-(L)-) 5)Unlatch (-(U)-)

Output

Symbol types such as pilot lights, motor starter coils, and solenoid coils represent types of RLL _____ field devices.

Input

Symbol types such as selector switches, float switches, and push buttons represent types of RLL _____ field devices.

Address

The PLC ____ bus carries the numerical addresses for all program data and information stored in memory.

Data

The PLC ____ bus moves parameter values between the processor memory, and modules.

Control

The PLC ____ bus moves pulses for the logical control of data movement.

program (software)

The PLC ______ determines the process output changes based upon the process input data (signals).

field devices

The ____ used to measure and manipulate process systems dictate the chassis size and the type and number of I/O modules that the controlling PLC is to have.

Optical Isolator

The _____ _____ electronically separates the process actuator driver circuit from the backplane interface for Current-Sourcing in DC input/output circuits.

word / field device

The address for a discrete input is I:6.0/4. The letter I indicates an input address, and the 6 indicates that the input module is in slot 6. The 0 indicates data is in _____ 0. The 4 indicates the point or terminal connection number for the ____ ____ input signal.

Signal conditioner

The input circuit that changes the voltage and current from the input field device to values compatible with the input of the optical isolator is called the ____ .

Timing

The timer ____ bit indicates when the timing action is occurring and is used to time the events in automation applications.

Enable

The timer _____ bit is like the instantaneous contact in mechanical and electrical timers.

Done

The timer _____ bit is like the timed contact in mechanical and electrical timers because it changes state when the timer process is complete. Changes states when the timer accumulator value equals the preset value.

Input field device

The_____ is a manual, mechanical, or process-actuated switch or sensor that measures a parameter value and provides a signal as field-generated information

Counter Underflow

This counter is True if the accumulated value wraps around from negative maximum value to positive maxium value. It is False if the accumulated value is equal to or less than the maximum negative value.

Counter Overflow

This counter is True if the accumulated value wraps around from positive maximum value to negative maximum value. It is False is the accumulated value is equal to or less than the positive maximum value.