Allen-Bradley 1771-QRD Installation And User Manual
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Allen-Bradley 1771-QRD Installation And User Manual

Allen-Bradley 1771-QRD Installation And User Manual

Pulse flowmeter module
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Allen-Bradley 1771-QRD Installation And User Manual

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Summary of Contents for Allen-Bradley 1771-QRD

  • Page 2 1771-QRD Pulse Flowmeter Module Installation and User’s Manual Artisan Scientific - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisan-scientific.com...
  • Page 3 In no event will Allen-Bradley Company be responsible or liable for indirect or consequential damages resulting from the use or application of this equipment.

  • Page 4: Table Of Contents

    How the 1771-QRD Works ......How the 1771-QRD Communicates With Programmable Controllers Chapter Summary .
  • Page 5 Table of Contents More on Overrange and Overflow ....Chapter Objectives ........Frequency Overrange Flags .

  • Page 6: Before You Begin

    Audience You must be able to program and operate an Allen-Bradley programmable controller to make efficient use of this module. In particular, you must know how to program Block Transfer instructions. If you do not, refer to the appropriate programming and operations manual for the processor you are using.

  • Page 7: Warnings And Cautions

    The 1771–QRD Module can be installed in any system that uses Allen-Bradley PLC–2, PLC–3 or PLC–5 Programmable Controllers with Block Transfer capability and 1771 I/O structure. Contact your nearest Allen-Bradley office for more information about programmable controllers. 1–2 Artisan Scientific - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisan-scientific.com...

  • Page 8: Product Compatibility

    Avoid placing the module adjacent to AC modules or high voltage DC modules. Related Publications Consult the Allen-Bradley Industrial Computer Group Publications Index (SD 499) for more information about programmable controllers. 1–3 Artisan Scientific - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisan-scientific.com...
  • Page 9 Chapter 1 Before You Begin 1–4 Artisan Scientific - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisan-scientific.com...

  • Page 10: Introduction

    Chapter 2 Introduction Chapter Objectives In this chapter you will read about: 1771–QRD Pulse Flowmeter Module features How the 1771–QRD Module communicates with programmable controllers Module Description and The Catalog No. 1771–QRD Pulse Flowmeter Module is an intelligent General Features block transfer module that interfaces Programmable Controllers with magnetic pickups, single channel shaft encoders, and turbine flowmeters, or with any source of TTL pulses.

  • Page 11: How The 1771-Qrd Works

    Chapter 2 Introduction How the 1771-QRD Works Figure 2.1 A Typical Channel The QRD is operated with block transfers. Block Transfer Reads report the count values, rates, and both overrange and overflow flags to the PLC. Block Transfer Writes are used by the PLC to reset the total count or to reset the overflow flags.

  • Page 12: How The 1771-Qrd Communicates With Programmable Controllers

    The ladder program can use and/or move the data before it is written over by the transfer of new data in a subsequent block transfer. Figure 2.2 Information flow through a programmable controller/1771-QRD System Chapter Summary In this chapter you read about the functional aspects of the 1771–QRD Module and how it communicates with a Programmable Controller.

  • Page 13: Installation

    Installation Chapter Objective In this chapter you will read how to install the 1771–QRD module in the I/O chassis. Installing the 1771-QRD Read this installation section completely before installing the module. Module Double check all connections before you begin programming.

  • Page 14: Module Location In The I/O Chassis

    Chapter 3 Installation Module Location in the I/O Place the module in any I/O module slot of the I/O chassis except for the Chassis extreme left slot. This slot is reserved for the programmable controllers or adapter modules. In addition: Do not put the module in the same module group as a discrete high-density module with 2-slot addressing.

  • Page 15: Electrostatic Discharge

    Chapter 3 Installation The sensor cable must be shielded. The shield must extend the length of the cable, but be connected only at the 1771–QRD end. The recommended sensor wiring cable type is Belden 8761 or similar. The functions of the individual terminals of the field wiring arm are shown in Figure 3.1.
  • Page 16 Chapter 3 Installation Figure 3.1 Field Wiring Arm WARNING: Explosion hazard. Do not disconnect equipment unless power has been switched off or the area is known to be nonhazardous. AVERTISSEMENT: Risque d’explosion. Avant de déconnecter l’équipment, couper le courant ou s’assurer que l’emplacement est designe non dangereux.
  • Page 17 Chapter 3 Installation Figure 3.2 Wiring for Pickups or Flowmeters 3–5 Artisan Scientific - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisan-scientific.com...
  • Page 18 Chapter 3 Installation Figure 3.3 Wiring for Active TTL Drivers Note: The jumper between terminals 17 and 19 changes the sensitivity of channels 3 and 4 so that they are compatible with TTL pulses. The jumper between terminals 17 and 20 changes the sensitivity of channels 1 and 2 so that they are compatible with TTL pulses.

  • Page 19: Indicators

    Chapter 3 Installation Indicators There are three indicator LEDs on the front panel. The indicator LED functions are listed in Table 3.A. Table 3.A Indicators Legend Color Type Function FAULT Solid One or more inputs are above 10.0 kHZ FAULT Flashing Internal hardware failure, or input rates drifiting above and below 10.0 kHz...

  • Page 20: Module Programming

    Chapter 4 Module Programming Chapter Objectives In this chapter you will learn about: Reading data from the 1771–QRD module Writing data to the 1771–QRD module Black transfer programming format Programming techniques Reading Data From The Block Transfer Read programming moves 9 words from the 1771–QRD Module Module to the processor’s data table.

  • Page 21: Overrange And Overflow

    Chapter 4 Module Programming Word 0 (1000) is the header code that identifies the data source as a 1771–QRD module. When the module is active, it also contains the status of the overrange and overflow flags. Overrange and overflow are discussed in more detail in the next section of this chapter.

  • Page 22: Example #1: Plc-5/15 Processor In A Local 1771 Backplane

    Chapter 4 Module Programming The following table outlines the examples that are contained in this chapter: Table 4.A Examples Contained in This Section Example Number System Type Page PLC-5/15 in a local 1771 backplane PLC-5/15 with Remote I/O PLC-3/10 with Remote I/O 4-12 These examples represent the most common configurations for a controller system.
  • Page 23 Chapter 4 Module Programming The eight physical slots labeled with Rack/Group/Slot (RGS) addresses in Figure 4.2 would have different RGS addresses if single or 1/2 slot addressing were chosen. Please refer to Figure 4.3 for dual, single, or 1/2 slot addressing RGS numbers.
  • Page 24 Chapter 4 Module Programming Set the PLC–5/15 configuration switches as shown in Figure 4.4. Figure 4.4 PLC-5/15 Configuration Dip Switches NOTE: The black area indicates the selected switch position (up or down). Set the 1771 backplane dip switch as shown in Figure 4.5. Figure 4.5 1771 Backplane Dip Switch.
  • Page 25 Chapter 4 Module Programming Apply power to the I/O chassis. Enter the Block Transfer rung shown in Figure 4.6 into the PLC–5/15 processor. Figure 4.6 Block Transfer Rung for a PLC-5/15 Processor NOTE: If the module is installed in a physical slot other than the fifth slot to the right of the PLC processor, the BTR block will have to be set up with a Rack/Group/Slot address other than 020.
  • Page 26 Chapter 4 Module Programming If all four input channels are being driven, we see that the value that appears at address #1 is the rate of the signal that appears at swingarm terminals 3 and 4. Note that the value that appears at address #3 is the rate of the signal that appears at swingarm terminals 6 and 7;...

  • Page 27: Example #2: Plc-5/15 With Remote I/O

    Chapter 4 Module Programming Example #2: PLC-5/15 with Remote I/O Install the module in the remote 1771 backplane,as shown in Figure 4.7. Figure 4.7 PLC-5/15 in a Local Backplane With an ASB in a Remote Backplane 4–8 Artisan Scientific - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisan-scientific.com...
  • Page 28 Chapter 4 Module Programming Set the PLC–5/15 configuration dip switches, as shown in Figure 4.8. Figure 4.8 PLC-5/15 Configuration Dip Switches NOTE: The black area indicates the selected switch position (up or down). Set the 1771 Backplane dip switch, as shown in Figure 4.9. Figure 4.9 Backplane Dip Switches NOTE: The black area indicates where the switch should be pressed with...
  • Page 29 Chapter 4 Module Programming Set the 1771–ASB configuration switches, as shown Figure 4.10. Figure 4.10 1771-ASB Configuration Dip Switches NOTE: The black area indicates where the switch should be pressed with a pencil or other sharp instrument. Set the remote 1771 backplane dip switch, as shown in Figure 4.11. Figure 4.11 1771 Remote Backplane Dip Switch NOTE: The black area indicates where the switch should be pressed with...
  • Page 30 Chapter 4 Module Programming Enter the Block Transfer Rung found in Figure 4.12 into the PLC–5/15. Figure 4.12 Block Transfer Rung for a PLC-5/15 With Remote I/O Place the PLC–5/15 Processor in RUN mode. Use the DATA MONITOR to examine data table address N36:0. This is where the QRD has stored the data from the four channels.

  • Page 31: Example #3: Plc-3/10 With Remote I/O

    Chapter 4 Module Programming Example #3: PLC-3/10 with Remote I/O Install the module in the remote 1771 backplane, as shown in Figure 4.13. Figure 4.13 PLC-3/10 with an ASB in a Remote Backplane 4–12 Artisan Scientific - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisan-scientific.com...
  • Page 32 Chapter 4 Module Programming Set the 1771–ASB configuration switches, as shown in Figure 4.14. Figure 4.14 1771-ASB Configuration Dip Switches NOTE: The black area indicates where the switch should be pressed with a pencil or other sharp instrument. Set the 1771 Remote Backplane dip switch, as shown in Figure 4.15. Figure 4.15 1771 Remote Backplane Dip Switch NOTE: The black area indicates where the switch should be pressed with...
  • Page 33 Chapter 4 Module Programming Enter the Block Transfer Rung found in Figure 4.16 into the PLC–3/10 processor. Figure 4.16 Block Transfer Rung for a PLC-3/10 with Remote I/O Place the PLC–3/10 Processor in RUN mode. Use the DATA MONITOR to examine data table address #N40:0. This is where the QRD has stored the rates from the four channels.

  • Page 34: More On Overrange And Overflow

    The 16 bits are grouped by function into four categories (Figure 5.1): Figure 5.1 Acknowledge Word (From 1771-QRD Module) Table 5.A Error Codes from Acknowledge Word Code...

  • Page 35: Totalizer Overflow Flags

    Chapter 5 More on Overrange and Overflow Each time an input for one (or more) of the channels is greater than 10.0 kHz, the overrange flag for that channel is set; for example, if the input frequency for channel 1 is greater than 10.0 kHz, bit #4 is set. (This is the first bit of the overrange group.) Acknowledge Word = 1010 = 0001 XXXX...

  • Page 36: Using A Block Transfer Write To Reset The Totalizer(S)

    Chapter 5 More on Overrange and Overflow Using A Block Transfer Write Any or all of the totalizers and overflow flags can be reset using a Block to Reset the Totalizer(s) Transfer Write command sent to the 1771–QRD from the PLC. For a PLC–5 processor, the rung might look like this: and/or Overflow Flags The Block Transfer Write sends the 1771–QRD one word that contains the...
  • Page 37 Chapter 5 More on Overrange and Overflow Figure 5.2 Example of Detecting and Resetting an Overflow Flag on Channel 1 5–4 Artisan Scientific - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisan-scientific.com...

  • Page 38: Chapter Summary

    Chapter 5 More on Overrange and Overflow The example in Figure 5.2 detects a count overflow on Channel 1, and resets the overflow bit for that channel with a Block Transfer Write command. The ladder logic also keeps track of the total number of counts received at the channel 1 inputs.

  • Page 39: Troubleshooting

    Chapter 6 Troubleshooting Chapter Objectives The following table may be used to identify the probable cause of difficulties with the 1771–QRD Module during initial installation. Symptom Probable Causes Possible Solutions No indicators lit Power not applied Check that power supply is turned on Green light off Power not applied Firmly reseat module in backplane...
  • Page 40 Chapter 6 Troubleshooting Symptom Probable Causes Possible Solutions Data counts to small value, Continuous BTW Reset Check ladder program to be sure that then jumps to zero the block transfer write is not causing continuous resets of the totalizer(s) Rates and counts from one Wiring reversal of + and - inputs Refer to wiring diagrams input appear in more than...

  • Page 41: Data Formats

    Appendix A Data Formats Block Transfer Write Format Use this block format to reset totalizer(s) and/or overflow flag(s). From PLC to QRD Note: b8 through b15 are unused. RESET RESET RESET RESET RESET RESET RESET RESET CH 4 CH 3 CH 2 CH 1 Overflow Flag...
  • Page 42 Appendix A Data Formats The digit in the response/error code labeled “Y” will adhere to the following definitions: channel channel channel channel 4 rate 3 rate 2 rate 1 rate overrange overrange overrange overrange “1” indicates overrange “0” indicates not overrange Note that the overrange condition causes both the rate and total to be zeroed The digit in the response/error code labeled “X”...

  • Page 43: Specifications

    Appendix B Specifications Power Requirements DC Supply Voltage from Backplane: 5 Volts 5% @ 0.50 A Maximum Note: This supply must meet the Allen–Bradley series B power bus specification. Typical supplies are 1771–P3, –P4, –P5, and –P7. Isolated Field Supply Required: none Environment Operating Temperature: 0 degrees C to 60 degrees C Storage Temperature: minus 40 degrees C to 85 degrees C...

  • Page 44: Operational Limits

    Appendix B Specifications Operational Limits Signal Characteristics, Turbine Flowmeter or Magnetic Pickup: 50 mV to 142 VAC RMS The signal should be approximately sinusoidal and must be AC. The signal must be greater than 50 mV peak to peak, and must be smaller than 400 V peak to peak.
  • Page 45 Specifications As a subsidiary of Rockwell International, one of the world’s largest technology companies — Allen-Bradley meets today’s challenges of industrial automation with over 85 years of practical plant-floor experience. More than 11,000 employees throughout the world design, manufacture and apply a wide range of control and automation products and supporting services to help our customers continuously improve quality, productivity and time to market.

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