Essay about Plc Design and style

Task:

a) Style of PLC design

UNITARY

Source: http://susaneatc.en.busytrade.com/selling_leads/info/1987765/Siemens-Simatic-S7-200-Cpu.html

* A union PLC is a less complicated type of control mechanism, and contains all of the basic products in a single housing, or field. These pieces typically consist of processor, which runs this program, in addition to the interface for input and output connections. PLC union generally attached straight to the device or perhaps application staying controlled. В В В * A good example of a widely used type of union PLC Micrologix 1000, built by Allen Bradley. Micrologix 1000 contains onboard memory space to store courses, 32 digital input and output slots, and a communications slot used to system the unit. This kind of preparation is typical a vast amount of union system.

MODULAR

Source: http://www.markbourgeois.com/portfolio/moellerusa_net/products/Automation/plc-hmi_plcMod.php

5. A modular PLC contains several different quests that can be combined together to develop a special control. Usually, since the basic module contains main functions like the regulation of energy, computer cpus, and suggestions connections. Additional modules, which include analog to digital sign converter or perhaps additional end result, can be added to this core unit as needed. This modular design enables the PLC to be customized and changed easily. 2. Allen Bradley Micrologix twelve hundred is among the a commonly used type of modular PLC. This kind of unit can handle between 23 and 40 advices and outputs. The actual volume of connections may be expanded by just adding themes. This provides versatility and is typical of many flip PLC.

RACK – INSTALLED

Source: http://www.softplc.com/news/07APR_TiDbits.html

* The sort of rack PLC installation is similar to the flip concept, although executed in a different way. While every module in the modular PLC connects directly to the base product, mounting rack PLC keep each distinct module. All additional themes that are linked via a network, and an area on the shelf modules organized. This method allows for a bigger system to get built, without becoming too cluttered and complicated. Frequent modules they offer and can be eliminated and put back as necessary. * Industrial units SLC 500 is definitely an example of an industry standard tray mounting type PLC. There is essentially not any limit towards the number of quests that can be in addition to this system, each installed in a standard holder chassis. This setup permits large-scale motorisation solutions to become built and is also common in factory options.

Source: http://www.ehow.com/list_6372341_types-plcs.html

Comparative Advantages and Disadvantages of fashion of PLC design

Style of PLC design

Relative| Advantage| Drawback

UNITARY| * Tiny * light * affordable tough * simple * easy to replace| * limited function 2. poor cadre * limited communication and data types * limited memory and program size * set inputs and outputs| MODULAR| * Have numerous I/O modules 2. Can be change easily * the backplane * the spine rail or base plate * generate communication| * Large 5. Expensive | RACK -- MOUNTED| 2. Expandable * powerful, complete function * full connection * good interface * essentially unlimited input/output 2. all features customizable| 2. Large 5. Expensive 5. Fragile 5. complicated

b) Type of Sensors

Limit Switch

Resource: https://www.egr.msu.edu/eceshop/Parts_Inventory/display_part_details.php?Part_Index=415

2. Limit switches are industrial control components are manufactured with different types of operators, including lever, tool plunger, and whisker type. Mechanical limit switches could be directly managed by the working lever movements. A reed switch can be used to indicate the proximity of a magnet...