Owner’s Guide 0300127-04 Rev.
Important Notes 1. Read all the information in this guide before installing the product. 2. The information in this owner's guide applies to hardware and software version 1.0 or later. 3. This guide assumes that the reader has a full working knowledge of the relevant processor. Notice The products and services described in this owner's guide are useful in a wide variety of applications.
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 Overview & Specifications Chapter 1 General Features And Benefits ......................
ii SLC 500™ Isolated Analog Input Modules Maintaining Your Module And Ensuring Safety Chapter 7 Preventive Maintenance ............................................................................. 47 Safety Considerations ................................................................................ 47 Verifying Calibration Appendix A Recommended Schedule .......................................................................... 49 Verifying Current Inputs ............................................
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. You should have a basic understanding of SLC 500 products.
4 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 & Operation Manual for Fixed Hardware Style Programmable Controllers 1747-6.
Preface 5 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. Common mode rejection ratio (CMRR) – The ratio of a device’s differential voltage gain to common mode voltage gain.
6 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. The “weight” of this value is defined as the fullscale range divided by the resolution.
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. Read this chapter to familiarize yourself further with your isolated analog module.
8 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.
Chapter 1: Overview And Specifications Table 3.
10 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.
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. Also, your module was calibrated by the manufacturer, so you don’t need to perform this task.
12 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. • Handle the module from the front, away from the backplane connector. Do not touch backplane connector pins.
Chapter 2: Installing And Wiring Your Module Selecting A Rack Slot 13 Two factors determine where you should install your module in the rack: ambient temperature and electrical noise.
14 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. To remove your module, press the retaining clips at the top and bottom of your module and slide it out.
Chapter 2: Installing And Wiring Your Module 15 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. At one end of the cable, twist the drain wire and foil shield together, bend them away from the cable, and apply shrink wrap. Foil Shield and Drain Wire Insulation Black Wire Clear Wire 5.
16 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. Figure 1. Wiring diagrams (showing differential inputs).
Chapter 2: Installing And Wiring Your Module 17 Table 7. Input module terminal block connections.
18 SLC 500™ Isolated Analog Input Modules Figure 2. Wiring schematic for 2-, 3-, and 4-wire analog inputs Your module does not provide power for analog inputs. Use a power supply that matches the transmitter specifications.
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 • auto-calibration time • channel enable and disable times • your module’s response to slot disabling How The Processor Communicates With Your Module Your processor transfers data to (and receives data from) the processor through an image table residi
SLC 500™ Isolated Analog Input Modules 20 Figure 4. Image table for your isolated analog input module Bit 15 Channel 0 Configuration Word SLC 5/0X Data Files Slot e Slot e Input Image Channel 1 Configuration Word Word 1 O:e.1 Channel 2 Configuration Word Word 2 O:e.2 Channel 3 Configuration Word Low Limit of User-Defined Scale A Word 3 O:e.3 Word 4 O:e.4 High Limit of User-Defined Scale A Low Limit of User-Defined Scale B Word 5 O:e.5 Output Image 8 Words Word 6 O:e.
Chapter 3: Things To Consider Before Using Your Module 21 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 & Step Response Time The speed of an analog module can be defined in 2 distinctly different ways: either by the channel update time or by the full-scale step response time.
22 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: • selecting a higher frequency input filter Note, however, that selecting a higher frequency input filter decreases the noise rejection and effective resolution, as described in the next subsection, “Selecting An Input Filter Frequency.
Chapter 3: Things To Consider Before Using Your Module 23 Table 9. Channel update time (based on number of channels enabled and filter frequency) Filter Frequency # of ch. enabled 50 Hz Current Input Voltage Input (-INI4vi only) 60 Hz 250 Hz 500 Hz 1 20.0 ms 16.6 ms 4.0 ms 4.1 ms 2 20.5 17.7 7.3 7.3 3 19.8 16.6 10.6 10.7 4 21.0 17.0 13.8 13.8 1 19.7 ms 16.6 ms 5.0 ms 5.0 ms 2 19.7 17.2 9.2 9.2 3 19.7 16.6 13.5 13.5 4 19.7 18.0 18.0 18.
24 SLC 500™ Isolated Analog Input Modules Figure 7. Signal attenuation with 60 Hz input filter -3 dB 0 -20 -40 -60 -80 Amplitude (in dB) -100 -120 -140 -160 -180 -200 0 60 120 180 240 300 360 Hz 1250 1500 Hz Signal Frequency 15.7 Hz Figure 8. Signal attenuation with 250 Hz input filter -3 dB 0 -20 -40 -60 -80 Amplitude (in dB) -100 -120 -140 -160 -180 -200 0 250 500 750 1000 Signal Frequency 65.
Chapter 3: Things To Consider Before Using Your Module 25 Figure 9. Signal attenuation with 500 Hz input filter -3 dB 0 -20 -40 -60 -80 Amplitude (in dB) -100 -120 -140 -160 -180 -200 0 500 1000 1500 2000 2500 3000 Hz Signal Frequency 131 Hz Auto-Calibration Time Your module requires some time to auto-calibrate a channel. During this time, your module cannot sample and convert input signals. Table 10 shows the time required for auto-calibration.
26 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 before using the slot disable feature. Failure to observe this precaution can cause unintended equipment operation.
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: • programming equipment, such as an Allen-Bradley Hand-Held Terminal (HHT) or personal computer • Allen-Bradley Advanced Programming Software (APS) or equivalent For help with APS, see the Getting Started Guide for APS.
28 SLC 500™ Isolated Analog Input Modules Configuring Each Input Channel Address O:e.0 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. 0 15 Channel 0 Configuration Word O:e.1 Channel 1 Configuration Word O:e.2 Channel 2 Configuration Word O:e.
Chapter 4: Using Your Input Module 29 Table 13. Input channel configuration word (O:e.0 through O:e.
30 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. Before accepting any new data as valid, verify that the status word (described in the last subsection of this chapter) reflects the changes you made.
Chapter 4: Using Your Input Module 31 Table 14. Data format definitions Data Format Selected Input Range Engineering Units ±10 V -10.25 V +10.25 V -10250 +10250 0–10 V -0.50 V +10.25 V -500 +10250 0–5 V -0.50 V +5.50 V -500 +5500 1–5 V +0.50 V +5.50 V +500 +5500 0–20 mA 0.0 mA +20.5 mA 0 +20500 4–20 mA +3.5 mA +20.
32 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: • If you select zero on open input circuit, your module sets the channel data word to zero during an open circuit condition. • If you select max.
Chapter 4: Using Your Input Module Setting The UserDefined Scale Limits (optional) Address O:e.4 33 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.
34 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 - Ulow) × (∆S) ÷ (∆U)} + Slow D = {(S - Slow) × (∆U) ÷ (∆S)} + Ulow where S = signal value (in engineering units, such as psi) Slow = low limit of signal value Shigh = high limit of signal value ∆S = Shigh - Slow D = data value (user-defined scale) Ulow = low limit of user-defined scale Uhigh = high limit of user-defined sc
Chapter 4: Using Your Input Module 35 In the preceding example... Monitoring Each Input Channel Address I:e.0 S low = 3.5 Ulow = 100 Shigh = 20.5 Uhigh = 9999 ∆S = 17 ∆U = 9899 The input signal data resides in words 0 through 3 of the input image file (addresses I:e.0 through I:e.3). The values present depend on the input types and data formats selected. When an input channel is disabled, its data word is set to zero. 0 15 Channel 0 Data Word I:e.1 Channel 1 Data Word I:e.
SLC 500™ Isolated Analog Input Modules 36 Table 15. Input channel status word (I:e.4 through I:e.
Chapter 4: Using Your Input Module 37 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. An over-range condition exists when the input value is very near or above the upper limit for that channel’s data format (see Table 14).
38 SLC 500™ Isolated Analog Input Modules
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. PID Control Your input module was designed to work directly with the SLC 5/02, 5/ 03, and 5/04 PID instruction—without an intermediate scaling operation.
40 SLC 500™ Isolated Analog Input Modules Figure 12. Programming for PID control example. Rung 2:0 First Pass Bit Initialize Module s:1 ] [ 15 Rung 2:1 Channel 0 Status I:3.4 ] [ 0 MOV 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). The output of the PID instruction is at N11:23 (Control Variable address).
Chapter 5: Ladder Program Examples User-Defined Scaling 41 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.
42 SLC 500™ Isolated Analog Input Modules
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 • troubleshooting Before testing your module, test your SLC 500 system using the procedures described in your system’s Installation & Operation Manual.
44 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: • Disconnect motor wires at the motor starter or the motor itself.
Chapter 6: Testing Your Module Interpreting The LED Indicators 45 Your module has five LEDs: four channel status LEDs (numbered 0–3 for channels 0–3, respectively) and one module status LED. Figure 17. LED block INPUT Channel 0 2 Status 1 3 Module Status Isolated Analog Use the following table to interpret the LEDs: Table 16. LED definition If the module And the channel status LED is… status LED is… Then... On On The channel is enabled.
46 SLC 500™ Isolated Analog Input Modules Troubleshooting Figure 18. Problem resolution flowchart Check LEDs on module. Module Status LED(s) off. Module Status LED on. Module fault condition. Check to see that module is seated properly in chassis. Cycle power. Channel Status LED(s) blinking. Channel Status LED(s) off. Channel Status LED(s) on. Fault condition. Channel is not enabled. Channel is enabled and working. Check channel status word bits 12–15.
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.
48 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.
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.
50 SLC 500™ Isolated Analog Input Modules 2. Let the operating temperature stabilize for 2 minutes. 3. Use the precision input source to provide a 15 mA input across a channel’s input terminals. + I IN – COM 4. Verify that the input data is between 15110 and 15260 counts. 5. Repeat steps 3 and 4 for each remaining channel. Verifying Voltage Inputs (-INI4vi only) 1.
Index 1746-NI4 compatibility, 30, 31 A Abbreviations 4 Accuracy 6, 9 Addressing 19–21 Ambient temperature 13 Analog-to-digital conversion 4, 8 APS 27 Attenuation 4, 23 Autocalibration 7, 8, 25, 29, 32, 49 B Backplane connector 12 Backplane current consumption 8, 12 Broken-wire response 7, 29, 32 C c-UL 10 Cable, recommended 10, 14 Calibration 7, 8, 11, 49 CE 10 Certifications 10 Channel configuring 28 enable/disable time 29 error 37 monitoring 35 status 35 Chassis ground 15, 16–17 Common mode rejection 5
52 SLC 500™ Isolated Analog Input Modules Inspection 43 Installation 13–14 Isolation 7, 8 J Jumper 11 L Ladder programming 19 examples 39 LEDs 7, 10, 45 Limits 20 LSB 6 M Maintenance 47 Manuals, related 4 Memory map 20 Module ID code 6, 8, 27 N Noise 7, 13, 14, 22 Non-fatal channel error 37 Normal mode rejection 6, 8 O Open-circuit response 7, 29, 32 Operating ranges 9 Operating temperature 10 Opto-electical isolation 8 Output image table 20 Over-current protection 7, 9 Over-range error 37 Over-volta
Getting Technical Assistance If you need technical assistance, please review the information in Chapter 6, “Testing Your Module,” before calling your local distributor of Spectrum Controls. Note that your module contains electronic components which are susceptible to damage from electrostatic discharge (ESD). An electrostatic charge can accumulate on the surface of ordinary plastic wrapping or cushioning material.
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. P.O. Box 5533 Bellevue, Washington 98006 Fax: (425) 641-9473 Tel: (425) 746-9481 Web Site: http://www.spectrumcontrols.com E-mail: spectrum@spectrumcontrols.
