First Set
6
CPU
A typical PLC can be divided into three components consisting of the processor unit, the power supply, and the programming device.
False
2
Input
8
Power Supply
5
Programming Interface
Power Supply
The —— converts line voltage (220 or 110 Vrms) into the proper DC voltage required by the I/O modules.
Jumpers or DIP (Dual In-line Package)
——— switches are usec configure racks
13
Filter network
12
Full-wave rectifier
remote chassis
If a —— is used, it will need a powerful power supply.
AC Input modules and Analog Input Modules.
Other input modules would include
3
Output
10
Output Module
Uses ——- a High level, graphic programming language similar to relays and contactor logic.
RELAY LADDER LOGIC
1
Rails
14
Regulator
4
Rungs
Programming device
Used to enter desired program into memory. Computer is most common.
Brings down high ac (240V) down to a lower voltage
What does the step-down transformer do?
to decrease high voltage from transmission lines to low voltage
What is a step down transformer used for?
Fixed I/O PLC's
are self contained meaning that the power supply, processor, and I/O connections are all in the same unit.
Lack of ——— allows frequent changes through programming quickly without any new components.
hard wiring
7
memory
Module I/0 devices
must have a distinct address to be recognized by the processor.
Designed to operate in an industrial environment with Variations in
temperature, vibration, humidity
Modular I/O PLC's
—— are made up of a chassis to hold the modules.
I/O Modules
—— for the Lab PLC are mounted in a chassis assembly which provides communications with the processor and power to operate.
ON/OFF
•Input modules provide —— status of buttons, switches, or sensors to the PLC's processor
Input Section
Changes voltage or current signal into a logic-level signal normally 5 Vdc
Power supply
Converts 120 or 240 AC volts to voltage DC Can be a separate unit or embedded
To operate, the CPU "reads" input data from connected field devices through the use of its input interfaces, and then "executes" or performs the control program that has been stored in its memory system
Describe when an interface occurs.
9
Input Module
Processor unit is called
Microprocessor "brain"
(PLC) is a ———- system for control and operation of manufacturing equipment
Solid-state
11
Step Down Transformer
number of modules
The size of the power supply is dependent upon the ______ required for the job
Real world
The term ——— is used to distinguish actual devices that exist and must be physically wired from the internal functions of the PLC system that duplicate the function of relays, timers, counters, on, even though none physically exists.