Plc Unit 1

In: Computers and Technology

Submitted By HardWorker92
Words 608
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Unit 1 Assignment 1: Introductory Topics

Chapter 1
1. PLC-is a specialized electronic device based on one or more microprocessors that is used to control industrial machines.
3.6.5 Billion dollar business and is growing 20% each year.
4. Similarities: Motherboard, processor, memory, expansion slot. Differences: PLCs do not have a removable or fixed drives; PLCs do not have a monitor, but have a HMI; PLCs only perform one task.
5. Symbols in the relay logic represent actual components and contacts present in the system, but the input/output instruction in PLC ladder logic represent only data values stored in the PLC memory.
7. The primary relay has a limited number of contacts, must have a real voltage sent to it, and has a limited lifetime.
10. –Backplane has copper conductors that deliver power to the module and also provide a data bus to exchange data between the modules and the processors.
-Processor is the cpu that handles all logical operations and performs all the mathematical computations.
-Power Supply provides power to the processor and to the modules plugged into the rack.
-Programming Devices are used to enter and download programs or to edit existing programs in the PLC.
-Input Interface provides the link between the PLC processor and the external drives that measure the conditions in the production area.
-Fixed and Modular Output modules provide the interface between the PLC processor and the external devices or actuators.
-Special Communications Modules provide a link for the PLC processor to the other computer-controlled machines and devices that must share data and control requirements with the PLC.
-Network Connections Box indicates that the PLC is linked to information level networks like the Ethernet and vender-specific networks called proprietary networks.
-PLC Special-Purpose Modules represent a broad collection of modules…...

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