Siemens and AllenBradley Hardware

Objectives 2 Upon completion of this chapter, students will be able to:  Describe the components of S7300 and CompactLogix  Understand the specifications of S7300 and CompactLogix PLC

Chapter 2:

Hardware of PLC

Siemens And AllenBradley

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Faculty of Electrical and Electronics Engineering

Department of Automation Control

Lecturer: Nguyen Tan Doi

Objectives

2

Upon completion of this chapter, students will be able to:

 Describe the components of S7300 and CompactLogix

 Understand the specifications of S7300 and

CompactLogix PLC

 Address I/O modules of S7300 and CompactLogix PLC

 Know how to connect sensors and actuators to PLC

PLC Overview

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Structure of a S7300 PLC

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 S7300 is a medium PLC of Siemens PLC

 Including CPU and modules pluged on backplanes (Racks)

 1 Rack connects 8 modules

 1 CPU controls 4 Rack

Connecting 4 Racks

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Digital Module

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Analog Module

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Memory (CPU with slot for Micro Memory Card)

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There are three storage areas:

 Load memory (located on MMC): collect code and data blocks (are transfered from the programming device)

 Main memory: process relevant code and data blocks

 System memory: process image of the Inputs (PII) and Outputs (PIQ), Bit memory (M), Timer (T), Counter (C)

Memory

Card

MMC - Micro Memory Card

Storage concepts

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Rules of Addressing I/O

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 Bit: Name of region memory + Byte Add + “.” + Bit order

Ex: I0.2, M2.5, Q1.0

 Byte: Name of region memory + “B” + Byte Add

Ex: IB2 (= I2.7 … I2.0) QB0 (= Q0.7 … Q0.0)

 Word:

Name of region memory + “W” + High Byte of Word Add

Ex: MW0 (= MB0 MB1) QW2 (= QB2 QB3)

 Dword:

Name of region memory +“D”+ High-HighByte of Word Add

Ex: ID0 (= IW0 IW2 = IB0 IB1 IB2 IB3)

Interfacing Memory and Modules

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Addressing Digital Modules

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Addressing Analog Modules

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Format Analog Word

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CompactLogix PLC

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 Structure of a CompactLogix station

 Digital and Analog modules

 Memory

 Tag based memory structure

Structure of CompactLogix

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 CompactLogix is medium size of Allen Bradley PLC

 Including 1 CPU and 16 modules pluged in backplane

 2 types: 1769-L2x, 3x, 4x and 5370-L1x, 2x, 3x

 Provide a Logix solution for machine level applications

Digital Input Modules

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1769-IQ32 24VDC Sink/ Source Input Module

Digital Output Modules

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1769-OB32 24VDC Source Output Module

Analog Input Modules

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Wiring Input Devices

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Analog Output Modules

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Wiring Output Devices

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Format Analog Word

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Memory

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 Two types of Memory: Programe and Data memory

 Memory is organized into blocks of many elements in

an array called a file

 Programe file holds the user programe

 There are 8 Data files defined by default

Memory files

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Tag based Memory structure

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 Most new genertion PLCs use

 A Tag is a friendly name for a memory location

 A Tag name also has a data type assigned

 Two types of Tag:

 Controller Tag: available to all programs

 Program Tag: just for one program only

 Base Tag: directly addresses a memory location

 Alias Tag: point to an addressed memory location

defined by another Tag

Temperature Control System

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