Spectrum Controls SLC 500 1746sc-INI4i Owner's Manual
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Spectrum Controls SLC 500 1746sc-INI4i Owner's Manual

Isolated analog input modules
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Owner's Guide 0300127-04 Rev. F
™
SLC 500
I
SOLATED
A
I
M
NALOG
NPUT
ODULES
Catalog Numbers
1746sc-INI4i
1746sc-INI4vi

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  • Page 1 Owner’s Guide 0300127-04 Rev. F ™ SLC 500 SOLATED NALOG NPUT ODULES Catalog Numbers 1746sc-INI4i 1746sc-INI4vi...
  • Page 3 No patent liability is assumed by Spectrum Controls with respect to the use of any of the information, products, circuits, programming, or services referenced herein.

  • Page 5: Table Of Contents

    Table Of Contents Preface Who Should Use This Guide ................ 3 What This Guide Covers ................3 Related Allen-Bradley Documents ............... 3 Terms & Abbreviations You Should Know ............ 4 Chapter 1 Overview & Specifications General Features And Benefits ..............7 Detailed Specifications.................
  • Page 6 ™ SLC 500 Isolated Analog Input Modules Maintaining Your Module Chapter 7 And Ensuring Safety Preventive Maintenance ................47 Safety Considerations ................47 Appendix A Verifying Calibration Recommended Schedule ................49 Verifying Current Inputs ................49 Verifying Voltage Inputs (-INI4vi only) ............50 Service .......................

  • Page 7: Preface

    Preface Read this preface to familiarize yourself with the rest of the owner’s guide. This preface covers: • who should use this guide • what this guide provides • related Allen-Bradley documents • terms & abbreviations you should know Who Should Use This Guide Use this guide if you design, install, program, or maintain a control system that uses Allen-Bradley Small Logic Controllers.
  • Page 8 ™ SLC 500 Isolated Analog Input Modules Table 1. Related Allen-Bradley documentation Allen-Bradley Doc. No. Title 1747-2.30 SLC 500 System Overview SGI-1.1 Application Considerations for Solid State Controls 1770-4.1 Allen-Bradley Programmable Controller Grounding and Wiring Guidelines 1747-6.2 Installation & Operation Manual for Modular Hardware Style Programmable Controllers 1747-NI001 Installation &...
  • Page 9 Preface channel to convert the data received from the processor to analog output signals at the terminals. Chassis – See rack. Common mode rejection – The maximum level to which a common mode input voltage appears in the numerical value read by the processor, expressed in dB.
  • Page 10 ™ SLC 500 Isolated Analog Input Modules Full-scale range (FSR) – The difference between the maximum and minimum specified analog values. Gain drift – The change in full-scale transition voltage measured over the operating temperature range of the module. LSB (least significant bit) – The bit that represents the smallest value within a string of bits.

  • Page 11: Overview & Specifications

    Chapter 1 Overview And Specifications The 1746sc-INI4i monitors up to 4 isolated analog current inputs, while the 1746sc-INI4vi monitors up to 4 isolated analog current or voltage inputs (selectable by channel). In both modules, you can select different input ranges (for example, 4–20 mA or 1–5 Vdc) independently, by channel, for optimal use of rack space.

  • Page 12: Detailed Specifications

    ™ SLC 500 Isolated Analog Input Modules State-of-the-Art Performance These modules incorporate proprietary Allen-Bradley technology, so they operate and perform like the latest high-performance Allen-Bradley products for full compatibility. Four selectable filter frequencies are provided for signal/noise optimization. For even greater convenience, they are fully configured through software (no DIP switches), can alert the processor to a variety of errors through status bits, and can scale input signals to user-defined ranges without any ladder programming.
  • Page 13 Chapter 1: Overview And Specifications Table 3. Electrical specifications—inputs Input Current Ranges 4 to 20 mA (selectable for each channel) 0 to 20 mA Input Voltage Ranges—INI4vi only (selectable for each channel) -10 to +10 Vdc 0 to 10 Vdc 0 to 5 Vdc 1 to 5 Vdc SLC Communication Formats...
  • Page 14 ™ SLC 500 Isolated Analog Input Modules Table 4. Physical specifications LED Indicators Four green channel status indicators, one for each channel One green module status indicator Recommended Cable Belden 8761 (shielded, twisted-pair) or equivalent Wire Size (maximum) One 12–24 AWG wire per terminal Terminal Block Removable (supplied) Table 5.

  • Page 15: Installing And Wiring Your Module

    Chapter 2 Installing And Wiring Your Module Read this chapter to install and wire your module. This chapter covers: • avoiding electrostatic damage • determining power requirements • selecting a rack slot • inserting your module into the rack • wiring your module Note that although your module has a jumper on its printed circuit board, this jumper is for the manufacturer’s use only, so do not alter its position.
  • Page 16 ™ SLC 500 Isolated Analog Input Modules Avoiding Electrostatic Damage Guard against electrostatic damage by observing the following precautions: CAUTION ELECTROSTATICALLY SENSITIVE COMPONENTS • Before handling the module, touch a grounded object to rid yourself of electrostatic charge. • When handling the module, wear an approved wrist strap grounding device.

  • Page 17: Selecting A Rack Slot

    Chapter 2: Installing And Wiring Your Module Selecting A Rack Slot Two factors determine where you should install your module in the rack: ambient temperature and electrical noise. When selecting a slot for your module, try to position your module: •...

  • Page 18: Wiring Your Module

    ™ SLC 500 Isolated Analog Input Modules 2. Slide your module into the chassis until both top and bottom retaining clips are secure. Apply firm even pressure on your module to attach it to its backplane connector. Never force your module into the slot. Cover all unused slots with the Card Slot Filler, Allen-Bradley part number 1746-N2.
  • Page 19 Chapter 2: Installing And Wiring Your Module 2. At each end of the cable, strip some casing to expose the individual wires. 3. Trim the exposed signal wires to 2 in. lengths. Strip about 3/16 in. (about 5 mm) of insulation away to expose the end of each wire. 4.
  • Page 20 ™ SLC 500 Isolated Analog Input Modules 7. Repeat steps 1 through 6 for each channel on your module. A system may malfunction due to a change in its operating environment. After installing and wiring your module, check system operation. See the system Installation and Operation Manual for more information.
  • Page 21 Chapter 2: Installing And Wiring Your Module Table 7. Input module terminal block connections. Label Function Channel V IN 0 + High differential voltage input (-INI4vi only) I IN 0 + High differential current input COM 0 - Low differential input, voltage & current, analog ground SHIELD 0 Chassis ground SHIELD 1...
  • Page 22 ™ SLC 500 Isolated Analog Input Modules Figure 2. Wiring schematic for 2-, 3-, and 4-wire analog inputs Important: Your module does not provide power for analog inputs. Use a power supply that matches the transmitter specifications. 2-Wire Transmitter Transmitter Module channel Power + In +...

  • Page 23: Things To Consider Before Using Your Module

    Chapter 3 Things To Consider Before Using Your Module Read this chapter to familiarize yourself with: • how the processor communicates with your module • the difference between channel update time and step response time • selecting an input filter frequency •...
  • Page 24 ™ SLC 500 Isolated Analog Input Modules Figure 4. Image table for your isolated analog input module Bit 15 Bit 0 Address Channel 0 Configuration Word Word 0 O:e.0 Channel 1 Configuration Word Word 1 O:e.1 Channel 2 Configuration Word Word 2 O:e.2 Channel 3 Configuration Word...

  • Page 25: The Difference Between Channel Update Time & Step Response Time

    Chapter 3: Things To Consider Before Using Your Module Important – A data word is valid only when the channel is enabled and there are no channel errors. A status word is valid only when the channel is enabled and the module has processed all configuration changes. The Difference Between Channel Update Time &...

  • Page 26: Selecting An Input Filter Frequency

    ™ SLC 500 Isolated Analog Input Modules In general, you can reduce the channel update time by doing any of the following: • disabling unused channels • selecting a higher frequency input filter You can reduce the full-scale step response time by: •...
  • Page 27 Chapter 3: Things To Consider Before Using Your Module Table 9. Channel update time (based on number of channels enabled and filter frequency) Filter Frequency # of ch. enabled 50 Hz 60 Hz 250 Hz 500 Hz Current Input 20.0 ms 16.6 ms 4.0 ms 4.1 ms...
  • Page 28 ™ SLC 500 Isolated Analog Input Modules Figure 7. Signal attenuation with 60 Hz input filter -3 dB -100 Amplitude (in dB) -120 -140 -160 -180 -200 360 Hz Signal Frequency 15.7 Hz Figure 8. Signal attenuation with 250 Hz input filter -3 dB -100 Amplitude (in dB)

  • Page 29: Auto-Calibration Time

    Chapter 3: Things To Consider Before Using Your Module Figure 9. Signal attenuation with 500 Hz input filter -3 dB -100 Amplitude (in dB) -120 -140 -160 -180 -200 1000 1500 2000 2500 3000 Hz Signal Frequency 131 Hz Auto-Calibration Time Your module requires some time to auto-calibrate a channel.

  • Page 30: Your Module's Response To Slot Disabling

    ™ SLC 500 Isolated Analog Input Modules Your Module’s Response To Slot Disabling By writing to the status file in the modular SLC processor, you can disable any chassis slot. Refer to your SLC programming manual for the slot disable/enable procedure. CAUTION POSSIBLE EQUIPMENT OPERATION Always understand the implications of disabling a module...

  • Page 31: Using Your Input Module

    Chapter 4 Using Your Input Module Read this chapter to: • enter your input module’s ID code • configure each input channel • set the user-defined scale limits (optional) • monitor each input channel • check each input channel’s configuration and status To use your module, you need: •...

  • Page 32: Configuring Each Input Channel

    ™ SLC 500 Isolated Analog Input Modules Configuring Each Input Channel After installing your module, you must configure each channel by setting bit values in each configuration word. Output words 0 through 3 of the output image file (addresses O:e.0 through O:e.3) configure channels 0 through 3, respectively.
  • Page 33 Chapter 4: Using Your Input Module Table 13. Input channel configuration word (O:e.0 through O:e.3) Use these bit settings in the channel configuration word To select… Input channel disable Input channel enable ±10 Vdc input range (-INI4vi only) 1–5 Vdc input range (-INI4vi only) 0–5 Vdc input range (-INI4vi only) 0–10 Vdc input range (-INI4vi only) 0–20 mA input range...
  • Page 34 ™ SLC 500 Isolated Analog Input Modules Input Channel Enable (configuration bit 0) Use this bit to enable or disable a channel. To minimize update times, disable any unused channels. When you set the channel enable bit to one, the module reads the configuration word.
  • Page 35 Chapter 4: Using Your Input Module Table 14. Data format definitions Selected Actual Signal Limits Count Limits Data Format Input Range Min. Max. Min. Max. ±10 V Engineering Units -10.25 V +10.25 V -10250 +10250 0–10 V -0.50 V +10.25 V -500 +10250 0–5 V...
  • Page 36 ™ SLC 500 Isolated Analog Input Modules Open Input Circuit Response (configuration bits 7 and 8) For 1–5 Vdc and 4–20 mA inputs only, use this bit field to define the state of the channel data word when your module detects an open circuit for that channel: •...

  • Page 37: Setting The User-Defined Scale Limits (Optional)

    Chapter 4: Using Your Input Module Setting The User- Defined Scale Limits (optional) For special applications (such as when using a sensor with a non-standard operating range), the 1746sc-INI4i and 1746sc-INI4vi input modules let you define up to two custom data formats. These “user-defined scales” are very similar to the “proportional counts”...
  • Page 38 ™ SLC 500 Isolated Analog Input Modules The following equations show you how to convert user-defined scale units (or any type of units) to engineering units, and vice versa: ) × (∆S) ÷ (∆U)} + S S = {(U - U ) ×...

  • Page 39: Monitoring Each Input Channel

    Chapter 4: Using Your Input Module In the preceding example... = 3.5 = 100 = 20.5 = 9999 high high ∆S = 17 ∆U = 9899 Monitoring Each Input Channel The input signal data resides in words 0 through 3 of the input image file (addresses I:e.0 through I:e.3).
  • Page 40 ™ SLC 500 Isolated Analog Input Modules Table 15. Input channel status word (I:e.4 through I:e.7) These bit settings in the status word Indicate this Input channel disabled Input channel enabled ±10 Vdc input range 1–5 Vdc input range 0–5 Vdc input range 0–10 Vdc input range 0–20 mA input range 4–20 mA input range...
  • Page 41 Chapter 4: Using Your Input Module The first 12 status bits reflect the settings in the channel configuration word. The remaining status bits flag the various errors that the module can detect. Over-Range Error (status bit 12) This bit is set to one whenever your module detects an over-range condition for a configured channel.
  • Page 42 ™ SLC 500 Isolated Analog Input Modules...

  • Page 43: Programming Examples

    Chapter 5 Programming Examples Read this chapter to familiarize yourself with how to use the advanced features of your module for: • PID control • user-defined scaling For information on how to use the Allen-Bradley Advanced Programming Software (APS) to create ladder programs, see the Getting Started Guide For APS.
  • Page 44 ™ SLC 500 Isolated Analog Input Modules Figure 12. Programming for PID control example. Rung 2:0 First Pass Bit Initialize Module MOVE Source N10:0 Dest O:3.0 Allocate N11:0 to N11: 22 for required Control Block file length of 23 words. The Process Variable is at I:3.0, which stores the value of input data word 0 (channel 0).
  • Page 45 Chapter 5: Ladder Program Examples User-Defined Scaling Your input module was designed to work directly with applications requiring special data scaling—without an intermediate scaling operation. Example — Suppose your input module is in slot 3, and you have a pressure sensor with a 4–20 mA range connected to channel 0. The following figures show you how to use the User-Defined Scaling data format to send specially scaled data (100 to 9999 in this example) to a simple display-only operator interface:...
  • Page 46 ™ SLC 500 Isolated Analog Input Modules...

  • Page 47: Testing Your Module

    Chapter 6 Testing Your Module Read this chapter to prevent potential problems in a systematic and controlled way. This chapter covers: • inspecting your module • disconnecting prime movers • powering up • interpreting the LED indicators • interpreting I/O error codes •...

  • Page 48: Powering Up

    ™ SLC 500 Isolated Analog Input Modules 2. Ensure that the shield for the cable used to wire your module is properly grounded. Refer to Chapter 2, Installing And Wiring Your Module, for more information. 3. Ensure that the removable terminal block on your module is secure. Disconnecting Prime Movers Before testing your module, ensure that machine motion will not occur:...

  • Page 49: Interpreting The Led Indicators

    Either the power is off, the module is powering up, or a module fault occurred. Cycle power. If the condition persists, call your local distributor or Spectrum Controls for assistance. Interpreting I/O Error Codes I/O error codes appear in word S:6 of the SLC processor status file. The first two digits of the error code identify the slot (in hexadecimal) with the error.

  • Page 50: Troubleshooting

    ™ SLC 500 Isolated Analog Input Modules Troubleshooting Figure 18. Problem resolution flowchart Check LEDs on module. Module Module Status LED(s) Status LED off. Module fault condition. Channel Channel Channel Status LED(s) Status LED(s) Status LED(s) blinking. off. Check to see that module is Fault Channel is...
  • Page 51 Chapter 7 Maintaining Your Module And Ensuring Safety Read this chapter to familiarize yourself with: • preventive maintenance • safety considerations The National Fire Protection Association (NFPA) recommends maintenance procedures for electrical equipment. Refer to article 70B of the NFPA for general safety-related work practices. Preventive Maintenance The printed circuit boards of your module must be protected from dirt, oil, moisture, and other airborne contaminants.
  • Page 52 ™ SLC 500 Isolated Analog Input Modules Standing Clear Of Machinery – When troubleshooting a problem with any SLC 500 system, have all personnel remain clear of machinery. The problem may be intermittent, and the machine may move unexpectedly. Have someone ready to operate an emergency stop switch. CAUTION POSSIBLE EQUIPMENT OPERATION Never reach into a machine to actuate a switch.
  • Page 53 Appendix A Verifying Calibration Read this chapter to verify your module’s calibration. To verify your module’s calibration, you need: • a precision input source whose accuracy is better than or equal to ±1 mV on a 10 V scale and ±0.5 µA on a 20 mA scale (such as an Electronic Development Corporation Programmable IEEE 488 GP-IB DC Calibrator, Model 521) •...
  • Page 54 4. Verify that the input data is between 31805 and 32131 counts. 5. Repeat steps 3 and 4 for each remaining channel. Service If the input data is out of range, call the Spectrum Controls Customer Satisfaction department (206-746-9481) to make arrangements for returning your module for factory calibration.
  • Page 55 Index 1746-NI4 compatibility, 30, 31 Differential operation 5, 6, 16 DIP switches 20 Disable/enable time 29 Drift 6, 9 Abbreviations 4 Accuracy 6, 9 Addressing 19–21 Ambient temperature 13 Effective resolution 5, 7, 22 Analog-to-digital conversion 4, 8 Electrical noise 13, 14, 22 APS 27 Electrostatic damage iii, 12 Attenuation 4, 23...
  • Page 56 ™ SLC 500 Isolated Analog Input Modules Inspection 43 Range error 37 Installation 13–14 Range, full-scale 6 Isolation 7, 8 Relative humidity 10 Removable terminal block 10 Repackaging iii, 12 Repeatibility 6 Jumper 11 Resolution 5, 6, 7, 9, 22 Response time 21 Ladder programming 19 examples 39...
  • Page 57 ESD packaging (such as static-shielding / metallized bag or black conductive container). Spectrum Controls reserves the right to void the warranty on any unit that is improperly packaged for shipment. For further information or assistance, please contact your local distributor or call Spectrum Controls Customer Satisfaction department at (425) 746- 9481 from 8:00 A.M.
  • Page 58 The ENCOMPASS logo and SLC 500 are trademarks of Allen-Bradley Company, Inc. Copyright © 1998-2004, Spectrum Controls, Inc. All rights reserved. Printed in U.S.A. Specifications subject to change without notice. Publication 0300127-04 Rev. F March 2009 U.S.A. Headquarters Spectrum Controls Inc.

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