MFET 374 Lab 7 Spr 10

MFET 374 Lab 7 Spr 10 - MFET 374 Manufacturing Integration...

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Lab #7, Working with Serial Data page 1 of 13 MFET 374 Manufacturing Integration I Spring 2010 Laboratory Assignment #7 Working with Serial Data Objectives: After completing this assignment, you will understand how to read bar code data into the ControlLogix PLC using RS-232 serial communications. You will also learn how to configure and use Allen- Bradley’s 2755-DS/DD bar code reader. In addition, this assignment will provide an opportunity to use PLC state machine programming. Background: Assumptions : It is assumed that you have: Configured the bar code decoder as described in the document: Configuring Allen-Bradley’s Bar Code Decoder. Properly aligned scanner A with the pallet’s bar code label. Read Chapter 17 in the manual: Logix5000 Controllers General Instructions Reference Manual. Documentation : It is assumed that your Instructor has delivered the following presentations: Introduction to Serial Communications The RS-232 Serial Interface In addition, the following documentation has been posted on the MFET 374 web site: Introduction to Allen-Bradley’s Bar Code Reader Configuring Allen-Bradley’s Bar Code Decoder Logix5000 Controllers General Instructions Reference Manual (from Rockwell Automation) Communications Cables : In this assignment we will use the prefabricated RS-232 cables located at each drop line.
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Lab #7, Working with Serial Data page 2 of 13 There are two prefabricated RS-232 cables available at each drop line: 1) A modem (M) cable This cable consists of a DB9 female and a DB25 male. As shown in Figure 1, the cable is typically used to connect a DTE (Data Terminal Equipment) with a 9 pin connector to a DCE (Data Communications Equipment) with a 25 pin connector. Figure 1 – Using the Modem Cable If the computer is connected to another DTE, a null modem adaptor must be used. 2) A null modem cable (NULL) This cable consists of a DB9 female and a DB25 male. As shown below in Figure 2, the cable is typically used to connect a DTE (with a 9 pin connector) to a DTE (with a 25 pin connector). Figure 2 – Using the Null Modem Cable In this assignment the RS-232 cables will be used as follows: In phase 1 you will use the modem cable (“M”) to connect COM 1 of the dropline computer to the auxiliary (AUX) port of the bar code decoder. This connection is used to configure the bar code decoder. In phases 2, 3 and 4 you will use the null modem cable (“NULL”) to connect channel 0 of the dropline PLC to the bar code decoders HOST port . This connection is used to read bar code data. NOTE: All serial connections will be made at the patch panel unless otherwise noted by your Instructor Computer DTE DB9 (male) DTE DB25 (female) RS-232 Null Modem Cable (“NULL”) Computer DTE DB9 (male) DCE DB25 (female) RS-232 Modem Cable (“M”)
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Lab #7, Working with Serial Data page 3 of 13 Bar Code Scheme : Bar code labels have been attached to each pallet that transports a hard disk assembly. With respect to
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This note was uploaded on 02/29/2012 for the course MFET 374 taught by Professor T.e.kostek during the Spring '10 term at Purdue.

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MFET 374 Lab 7 Spr 10 - MFET 374 Manufacturing Integration...

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