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    Last Updated: 31-March-2009 TB-960702B

    OMNI FLOW COMPUTERS, INC.

    12620 West Airport Boulevard, Suite 100Sugar Land, Texas 77478 United States of AmericaPhone-281.240.6161 Fax: 281.240.6162

    www.omniflow.com52-0002-0001/Rev B Page 1 of 6

    Technical Bulletin,

    Communicating with Allen-Bradley

    TM.Programmable LogicControllers

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    TB-960702B Communicating with Allen-BradleyTM

    Programmable Logic Controllers

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    NOTE: User Manual Reference - This Technical Bulletin complements the information contained in theUser Manuals, and is applicable to all firmware revisions.

    This bulletin was previously published as an appendix to user manuals of firmware revisionsVersion .70 and earlier.

    Allen-Bradley Communications This feature allows communicating with Allen-BradleyTM

    PLCs.However, OMNI Flow Computers is not responsible for the operation, connectivity or compatibilityof Allen-Bradley products, and furthermore, we do not warrant these products.

    Table of Contents

    Scope............................................................................................................................................3

    Abstract .........................................................................................................................................3

    Protocol and Error Checking.........................................................................................................3

    PLC Supported..............................................................................................................................3

    Flow Computer Database..............................................................................................................3

    4th and 5th Digit from the Right Identifies Type of Variable......................................................33rd Digit from Right Identifies which Area within the Application ..............................................3

    How the Allen-Bradley Accesses the OMNI Flow Computer Database.....................................4PLC-2 ........................................................................................................................................4PLC-3 ........................................................................................................................................4PLC-5 ........................................................................................................................................4Valid Starting Addresses of PLC-5 Files ...................................................................................5

    16-Bit Integers........................................................................................................................5

    8-Character Strings................................................................................................................5

    32-Bit Integers........................................................................................................................5

    32-Bit IEEE Floating Points....................................................................................................5

    Bit Integers.............................................................................................................................5

    16-Character Strings..............................................................................................................5

    32-Bit Integers........................................................................................................................532-Bit IEEE Floating Points....................................................................................................5

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    Programmable Logic Controllers

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    Scope

    All firmware revisions of OMNI 6000/OMNI 3000 Flow Computers allow communications with Allen-Bradley Programmable Logic Controllers (PLCs). This Technical Bulletin refers to communicationaspects specific to the OMNI Flow Computer and serves as information only. Please refer to themanufacturer for any support or information on Allen-Bradley products.

    AbstractThe OMNI 6000 Flow Computer provides serial communications via port # 4 between the flow computerand an Allen-Bradley Programmable Logic Controller (PLC), usually via a KE or KF CommunicationModule connected to the Data Highway. Data is transmitted serially at a maximum rate of 38.4 kbpsusing 8 data bits, 1 stop bit and no parity bit. Average speed of response to a message request isapproximately 75 msec.

    Protocol and Error Checking

    Both the DFI full duplex protocol and the half duplex protocol are supported. CRC or BCC error checkingcan be utilized when using either full duplex or half duplex.

    PLC Supported

    The OMNI computer supports the following Allen-Bradley PLC types and messages. Note that bit leveloperations are not supported.

    PLC-2 Unprotected Block Reads and Writes

    PLC-3 Word Range Reads and Writes

    PLC-5 Typed Reads and Writes

    SLC-5/02, 5/03 Unprotected Typed Reads and Writes

    Flow Computer Database

    Serial Ports #1, #2, #3 and #4 in .74+ firmware revisions support communications using superset ofModbus Protocol. This is the native communications language of the flow computer. Several thousandvariables are available within the Database. The primary numbering system used to identify thesevariables is their 'index number'. The actual digits of the index number indicate the type of variable and in

    many cases application area within the computer.

    4th and 5th Digit from the Right Identifies Type of Variable

    1??? Variable is a digital status or command bit

    3??? Variable is a 16 bit signed integer

    4??? Variable is a 8 character ASCII string

    5??? Variable is a 32 bit signed integer

    7??? Variable is a 32 bit IEEE floating point

    8??? Variable is a 32 bit IEEE floating point

    13??? Variable is a 16 bit signed integer

    14??? Variable is a 16 character ASCII string

    15??? Variable is a 32 bit signed integer17??? Variable is a 32 bit IEEE floating point

    3rd Digit f rom Right Identifies which Area within the Application

    ?1?? Variable relates to Meter Run #1

    ?2?? Variable relates to Meter Run #2

    ?3?? Variable relates to Meter Run #3

    ?4?? Variable relates to Meter Run #4

    ?5?? Variable is scratchpad

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    Programmable Logic Controllers

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    ?6?? Variable is PID related or scratchpad

    ?7?? Variable is a command write.

    ?8?? Variable is related to station functions

    ?9?? Variable is related to prover functions

    How the Allen-Bradley Accesses the OMNI Flow Computer Database

    PLC-2This family is usually limited as to the type of data and address range. Data is always transferred asblock reads and writes.

    Five (5) translation tables are provided where the user can specify what data within the database will beconcatenated into read or write groups. The starting address of each data block is selectable.

    NOTE: The PLC2 does not understand 32-bit integer or 32-bit IEEE floating points but can pass thesevariable types to devices that do understand them.

    Translation Tables #1 through #3 are used to set up block reads which can contain status points packed16 to a word, 16-bit or 32-bit integers and IEEE floating points.

    Translation Table #4 is used for block writes of status and command bits only. Data is packed 16 to aword.

    Translation Table #5 provides for block writes to any selected data.

    PLC-3

    This family can use the methods described as well as 'word range reads and writes' of any variable withinthe database (refer to PLC-5 list for starting addresses).

    PLC-5

    This family utilizes 'typed reads and writes' of the complete Database. To accommodate the PLC-5 'filesystem method of addressing, the Modbus index numbers serve as the basis of the internal file system ofthe computers as it appears to a PLC-5 device. Table 1 shows typical examples:

    Table 1. Modbus Indices Versus PLC-5 Addresses

    MODBUSINDEX #

    PLC-5 ADDRESS ELEMENT SIZE COMMENT

    1101 N11:01 1 Word (16 Flags) Meter #1 Status Flags

    1217 N12:17 1 Word (16 Flags) Meter #2 Status Flags

    1701 N17:01 1 Word (16 Flags) Command Flags

    3201 N32:01 1 Word (Integer) Meter #1 Data

    3210 N32:10 1 Word (Integer) Offsets track

    3901 N39:01 1 Work (Integer) Prover Data

    4101 B41:01 1 Byte (ASCII) 4Words per Variable

    4102 B41:02 1 Byte (ASCII) 1Byte per element

    5101 N51:01 1 Word (Long Integer) 2 Words per variable

    5102 N51:02 1 Word (Long Integer) 2Words per variable

    5103 N51:03 1 Word (Long Integer) Same again

    7401 F74:01 2 Words (IEEE Float) 2 Words per variable

    7405 F74:05 2 Words (IEEE Float) Offsets track

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    Valid Starting Addresses of PLC-5 Files

    16-Bit Integers

    N10:01 N11:01 N12:01 N13:01 N14:01 N15:01 N16:01 N17:01 N18:01 N19:01

    N30:01 N31:01 N32:01 N33:01 N34:01 N35:01 N36:01 N37:01 N38:01 N39:01

    8-Character Strings

    B41:01 B42:01 B43:01 B44:01 B45:01 B46:01 B47:01 B48:01 B49:01

    32-Bit Integers

    N51:01 N52:01 N53:01 N54:01 N55:01 N58:01 N59:01

    32-Bit IEEE Floating Points

    F70:01 F71:01 F72:01 F73:01 F74:01 F75:01 F76:01 F77:01 F78:01 F79:01

    Bit Integers

    N130 :01 N134:01

    16-Character StringsB140:01

    32-Bit Integers

    N150:01

    32-Bit IEEE Floating Points

    F170:01

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    DOCUMENT REVISION HISTORY

    DOCUMENT INITIAL RELEASE DATE......................................................06-May-2003

    REVISION DATE PURPOSE / CHANGE REQUESTA 06-May-2003 Maintained on the Web - Initial release

    B 31-March-2009 DCR 090075


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