Spectrum Controls 1794 User Manual
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Spectrum Controls 1794 User Manual

Isolated universal input module
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User's Manual Pub. 0300231-03 Rev. A
1794 Isolated
Universal Input Module
Catalog Number: 1794sc-IF8IU

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  • Page 1 User’s Manual Pub. 0300231-03 Rev. A 1794 Isolated Universal Input Module Catalog Number: 1794sc-IF8IU...

  • Page 2: Notice

    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 3: Table Of Contents

    2.4.3 Mounting the IF8IU Module on the Terminal Base Unit ................2-9 2.5 F ........................2-10 ECTION IELD IRING ONNECTIONS 2.5.1 Field Wiring using a 1794-TB3G and TB3GS Terminal Base ..............2-10 2.6 M ..........................2-16 ECTION ODULE NDICATORS CHAPTER 3 CONFIGURING THE 1794SC-IF8IU USING RSLOGIX 5000 ..............3-1 3.1 T...
  • Page 4 Flex™ IO Isolated Universal Input Module 3.4.12 CJC Offset [Words 41 to 48] ........................3-14 3.5 R & S ........................3-14 ECTION NPUT TATUS 3.5.1 Input Data [Words 0 to 7] ........................3-16 3.5.2 UnderRange Alarms [Word 8 (Bits 0 to 7)] ..................... 3-16 3.5.3 OverRange Alarm [Word 8 (Bits 8 to 15)] ....................
  • Page 5 Related Documentation The table below provides a listing of publications that contain important information about Allen-Bradley PLC systems. Document Title Document Number 1794 Flex IO Product Data 1794-2.1 CompactLogix System Overview 1769-SO001A-EN-P ControlLogix System User Manual 1756-6.5.13-SEP99 ControlNet Modules in Logix5000 Control Systems...
  • Page 6 Flex™ IO Isolated Universal Input Module Conventions Used in This Manual The following conventions are used throughout this manual:  Bulleted lists (like this one) provide information not procedural steps.  Numbered lists provide sequential steps or hierarchical information.  Italic type is used for emphasis ...

  • Page 7: Chapter 1 Module Overview

    Chapter 1 Module Overview This chapter describes the 1794sc-IF8IU Isolated Universal input module and explains how the module reads current, voltage, RTD, resistance and thermocouple/millivolt analog input data. Included is information about:  General description  Input types and ranges ...

  • Page 8: Section 1.3 Data Formats

    Flex™ IO Isolated Universal Input Module Input Type Range 120 Ω Ni α 0.672 -80 to 260 ˚C (-112 to 500 ˚F) 604 Ω NiFe α 0.518 -100 to 200 ˚C (-148 to 392 ˚F) 0 to 150 Ω 0 to 1000 Ω Resistance 0 to 3000 Ω...

  • Page 9: Section 1.6 System Overview

    Chapter 1: Module Overview RTD and resistance type inputs. Two cold junction compensation (CJC) sensors can be added to the terminal base unit to enable accurate readings when using thermocouple input types. Each CJC sensor compensates for offset voltages introduced into the input signal as a result of the cold-junction where the thermocouple wires come into contact with the base unit.

  • Page 10: Section 1.7 Module Operation

    See the block diagram below. Isolation Barrier 8 of 8 1 of 8 1794 FLEX 8 Channels & Backplane Terminal Base Unit ADC 24VDC PWR...

  • Page 11: Chapter 2 Installation And Wiring

    Chapter 2 Installation and Wiring This chapter will cover:  Compliance to European union directives  General considerations  Power requirements  Installing the module  Field wiring connections Section 2.1 Compliance to European Union Directives This product is approved for installation within the European Union and EEA regions. It has been designed and tested to meet the following directives.

  • Page 12: Section 2.2 General Considerations

    Flex™ IO Isolated Universal Input Module Section 2.2 General Considerations Flex I/O is suitable for use in an industrial environment when installed in accordance with these instructions. Specifically, this equipment is intended for use in clean, dry environments Pollution degree 2 and to circuits not exceeding Over Voltage Category (IEC 60664-1) 2.2.1 Hazardous Location Considerations...

  • Page 13: Remove Power

    Away from sources of electrical noise such as hard-contact switches, relays, and AC motor drives  Away from modules which generate significant radiated heat, such as the 1794- OB32. Refer to the module’s heat dissipation specification. In addition, route shielded, twisted-pair analog input wiring away from any high voltage I/O wiring.
  • Page 14 Flex™ IO Isolated Universal Input Module Do not daisy chain power or ground from the terminal base unit to any ac or dc digital module terminal base unit. Attention Daisy-chaining IF8u IF8u Frequency Input Power Module Module Module 24 VDC Note: All modules must be frequency or IF8IU modules for this configuration.

  • Page 15: Section 2.4 Installing The Module

    Chapter 2: Installation and Wiring Combination Frequency Input IF8u Frequency Input Power Module Module Module 24 VDC 24 VDC Note: All modules powered by the same power supply must be frequency or IF8IU modules for this configuration. Total current draw through any base unit must not be greater than Section 2.4 Installing the Module...
  • Page 16 Flex™ IO Isolated Universal Input Module 46277-3) at a slight angle with hook B on the left side of the terminal base hooked into the right side of the unit on the left. Proceed as follows: User's Manual Pub. 0300231-03 Rev. A...

  • Page 17: Panel/Wall Mounting

    If you are installing your module into a terminal base unit that is already installed, proceed to “Mounting the IF8IU Module on the Terminal Base Unit” on page 2-9. Use the mounting kit Cat. No. 1794-NM1 for panel/wall mounting. User's Manual Pub. 0300231-03 Rev. A...
  • Page 18 Flex™ IO Isolated Universal Input Module To install the mounting plate on a wall or panel: 1) Lay out the required points on the wall/panel as shown in the drilling dimension drawing. Drilling Dimensions for Panel/Wall Mounting of Flex IO 2) Drill the necessary holes for the #6 self-tapping mounting screws.

  • Page 19: Mounting The If8Iu Module On The Terminal Base Unit

    2.4.3 Mounting the IF8IU Module on the Terminal Base Unit The IF8IU isolated input module mounts on a 1794-TB3G or TB3GS terminal base unit. 1) Rotate the key-switch (1) on the terminal base unit (2) clockwise to position 3 as required for the IF8IU module.

  • Page 20: Section 2.5 Field Wiring Connections

    1794-TB3GS 1794sc-IF8IU 2.5.1 Field Wiring using a 1794-TB3G and TB3GS Terminal Base 1) Connect the individual signal wiring to numbered terminals on the 0–15 row (A) and 17–32 row (B) on the terminal base unit. Connect the input devices as shown in the wiring table on page 2-11 .
  • Page 21 Chapter 2: Installation and Wiring 2-11 The IF8IU module does not receive power from the backplane. +24V dc power must be applied to your module before operation. If power is not applied, the module position will appear to the adapter as an Attention empty slot in your chassis.
  • Page 22 (with 38 and 47 chassis GND). Connect the tail of CJC 1 to terminal 1 and CJC2 to terminal 31 if channels 0…3 or 0…7 are configured for thermocouples. Table 2-3 1794-TB3G and 1794-TB3GS Terminal Base Units Signal Return (R) Input + Input...
  • Page 23 Chapter 2: Installation and Wiring 2-13 Total current draw through the terminal base unit is limited to 10A. Separate power connections to the terminal base unit may be necessary. Attention The following examples show how to wire the IF8U using the tables and diagrams listed above.
  • Page 24 Flex™ IO Isolated Universal Input Module 2-14 Figure 2-3 (Thermocouple Wiring Diagram) Figure 2-4 (Voltage Wiring Diagram) User's Manual Pub. 0300231-03 Rev. A...
  • Page 25 Chapter 2: Installation and Wiring 2-15 Figure 2-5 (Current Wiring Diagram) Digital and analog power must be supplied by an Isolated Secondary Limited Energy Low Voltage source. Attention User's Manual Pub. 0300231-03 Rev. A...

  • Page 26: Section 2.6 Module Indicators

    Flex™ IO Isolated Universal Input Module 2-16 Section 2.6 Module Indicators The IF8IU module has one status indicator (OK) that is on when power is applied and no hardware faults are present. See figure below. Figure 2-6 Item Description Module Catalog Number Module key-switch position Removable label Power/Status LED...

  • Page 27: Chapter 3 Configuring The 1794Sc-If8Iu Using Rslogix 5000

    Chapter 3 Configuring the 1794sc-IF8IU Using RSLogix 5000 This chapter covers the following subjects:  Things you should know  Module memory map  Configure generic profile  Module configuration  Reading input/status data Section 3.1 Things You Should Know This chapter describes how to configure the IF8IU module for the ControlLogix and CompactLogix system.

  • Page 28: Section 3.3 Configure Generic Profile

    Choosing an Electronic Keying method Add the new remote module to your project, such as a Flex Control Net adapter or Ethernet Adapter (i.e. 1794-ACN15 or 1794-AENT, respectively). Configure the remote module similarly to the local module Download the configuration to the controller Note: If you are using Control Net, you must schedule the network using “RSNetworks for Control Net”...

  • Page 29: Add A Local Ethernet Bridge Module

    Chapter 3: Configuring the 1794sc-IF8IU for ControlLogix/CompactLogix Net port in the local chassis. In this case, you don’t need to add a separate local communication module. Note: When you create a new RSLogix 5000 project with the CompactLogix 1769-L23E, 1769-L32E or L35E controller, The Controller Organizer creates a Ethernet port in the local chassis.

  • Page 30: Add A Remote Ethernet Flex Adapter

    Flex™ IO Isolated Universal Input Module Select the local Ethernet bridge module Click OK Configure the local Ethernet bridge module. Name the module Enter IP address of ENBT Select the module’s slot number Select the module’s revision level Select electronic keying level Click OK 3.3.2 Add a Remote Ethernet Flex Adapter After you have added the local Ethernet communication module, you must add remote...
  • Page 31 Chapter 3: Configuring the 1794sc-IF8IU for ControlLogix/CompactLogix If you plan to use the Flex Control Net adapter, you will need to install the 1794sc-IF8IU EDS file before scheduling the network. The latest EDS files can be found at (www.spectrumcontrols.com). Attention Select a New Module for the I/O Configuration.

  • Page 32: Add The Generic Flex Module

    Flex™ IO Isolated Universal Input Module 3.3.3 Add the Generic Flex Module After adding the remote Ethernet communication module, the Generic Flex Module must be added. The Generic Flex Module is required because there is no custom profile for the 1794sc-IF8IU module.

  • Page 33: Section 3.4 Module Configuration

    Chapter 3: Configuring the 1794sc-IF8IU for ControlLogix/CompactLogix Select Generic Flex Module Click OK Configure the Generic Flex Module (i.e. 1794sc-IF8IU) Name the module Enter “Input Data – INT” for Comm. Format Enter module slot # Enter the config. size Enter the input size Enter the status size (Always 8 for the IF8IU) (Always 49 for the IF8IU)
  • Page 34 Flex™ IO Isolated Universal Input Module [Name of remote communication module]:e:x.Data[0 to 184] e = IF8IU slot number x = Image Type (i.e. C, I, or O) Note: 185 words are allocated by the Generic Flex Module profile, but only 49 are actually used by the IF8IU module for configuration.

  • Page 35: Fault Mode [Word 0 (Bits 2,3,4,5,10,11,12,13)]

    Chapter 3: Configuring the 1794sc-IF8IU for ControlLogix/CompactLogix Usage (16 bit words): 11 10 2 1 0 C:7 Temp Disable Open Data Input Input Units Circuit Format Filter Type C:8 Temp Disable Open Data Input Input Units Circuit Format Filter Type CH0 User Low Alarm Threshold C:10 CH0 User High Alarm Threshold C:11 CH0 User Alarm Deadband...

  • Page 36: Input Type [Words 1 - 8 (Bits 0 To 4)]

    Flex™ IO Isolated Universal Input Module 3-10 Table 3-2 (Fault Mode) State Function Disabled Enable Broken Wire Detection 3.4.2 Input Type [Words 1 – 8 (Bits 0 to 4)] Use the table below to select the input type for each channel. Table 3-3 (Input Type) Bit 4 Bit 3...

  • Page 37: Data Format

    Chapter 3: Configuring the 1794sc-IF8IU for ControlLogix/CompactLogix 3-11 16.7 Hz 19.6 Hz 62.0 Hz 470.0 Hz *Unused *Unused 3.4.4 Data Format [Words 1 – 8 (Bits 8 to 10) Select the appropriate data type for each channel using the table below. Refer to Table 3-6 for data type ranges.

  • Page 38: Open Circuit Mode [Words 1 - 8 (Bits 12 & 13)]

    Flex™ IO Isolated Universal Input Module 3-12 Input Type Range Eng. Units Eng Units X10 Raw/Prop Percent -100 to 260 ˚C -1000 to 2600 -100 to 260 -32768 to 32767 0 to 16383 0 to 10000 10 Ω Cu α 0.426 (-148 to 500 ˚F) (-1480 to 5000) (-148 to 500)

  • Page 39: Low Alarm Threshold [Words 9,12,15,18,21,24,27,30]

    Chapter 3: Configuring the 1794sc-IF8IU for ControlLogix/CompactLogix 3-13 3.4.8 Low Alarm Threshold [Words 9,12,15,18,21,24,27,30] Low alarm threshold setting for channels 0 through 7, respectively. Note: The data range is determined by the data format selected. 3.4.9 High Alarm Threshold [Words 10,13,16,19,22,25,28,31] High alarm threshold setting for channels 0 through 7, respectively.

  • Page 40: Cjc Offset [Words 41 To 48]

    Flex™ IO Isolated Universal Input Module 3-14 (10000 - -1000) = 20000 20000 X 0.20 = 4000 Cal offset may be between -4000 to + 4000. It must be in the same range and format as the selected channel data and will be added to the final result post scaling.
  • Page 41 Chapter 3: Configuring the 1794sc-IF8IU for ControlLogix/CompactLogix 3-15 Figure 3-4 (Input/Status Tags) Note: The slot number is “0” and the image type is “I”. User's Manual Pub. 0300231-03 Rev. A...

  • Page 42: Input Data [Words 0 To 7]

    Flex™ IO Isolated Universal Input Module 3-16 The table below describes the input and status mapping. Table 3-10 (Input & Status) Usage (16 bit words): I:0 Channel 0 input Data. I:1 Channel 1 input Data. I:2 Channel 2 input Data. I:3 Channel 3 input Data.

  • Page 43: Open Circuit Alarm [Word 10 (Bits 0 To 7)]

    Chapter 3: Configuring the 1794sc-IF8IU for ControlLogix/CompactLogix 3-17 3.5.6 Open Circuit Alarm [Word 10 (Bits 0 to 7)] If set, the associated channel has detected a shorted or open circuit condition. 3.5.7 CJC Alarm [Word 10 (Bits 8 & 9)] The CJC alarm indicates a broken wire condition for both CJC sensors.
  • Page 44 Flex™ IO Isolated Universal Input Module 3-18 Hex Error Code: Diagnostic: 0x47 CH7_HI_LO_ALARM_CFG_ERROR 0x50 CH0_OUT_OF_RANGE_ERROR 0x51 CH1_OUT_OF_RANGE_ERROR 0x52 CH2_OUT_OF_RANGE_ERROR 0x53 CH3_OUT_OF_RANGE_ERROR 0x54 CH4_OUT_OF_RANGE_ERROR 0x55 CH5_OUT_OF_RANGE_ERROR 0x56 CH6_OUT_OF_RANGE_ERROR 0x57 CH7_OUT_OF_RANGE_ERROR 0x59 Unused module cfg bits set 0x5F MODULE_NOT_CONFIGURED 0x60 CH0 Cal Offset CFG Error 0x61 CH1 Cal Offset CFG Error 0x62...
  • Page 45 Chapter 3: Configuring the 1794sc-IF8IU for ControlLogix/CompactLogix 3-19 Hex Error Code: Diagnostic: 0xC0 CJC0_BROKEN_INPUT 0xC1 CJC1_BROKEN_INPUT 0xC2 CJC_BOTH_BROKEN_INPUT User's Manual Pub. 0300231-03 Rev. A...
  • Page 46 Flex™ IO Isolated Universal Input Module 3-20 User's Manual Pub. 0300231-03 Rev. A...
  • Page 47 Appendix A Module Specifications Number of inputs 8 channels Module Location Cat. No. 1794-TB3G, 1794-TB3GS Terminal Base Units Nominal input voltage ranges ±50 mV, ±100 mV, 0-5 V, 1-5 V, 0-10V, and ±10 V Nominal input current ranges 0-20mA, 4-20mA Supported thermocouple types Type °C Range...
  • Page 48 Current mode ± 7.8 VDC continuous (ten minutes) -20…100 °C Cold junction compensation Range Cold junction compensator A-B catalog number 1794-CJC2 Flexbus current 80 mA Power dissipation 7.25 W max @ 31.2V dc Thermal dissipation Max 10.2 BTU/hr @ 31.2V dc...

  • Page 49: Appendix A Module Specifications

    Appendix A: Module Specifications Repeatability Accuracy Accuracy Limit Voltage Accuracy Limit Limit At 0- At °25C & 4.17 with 4.17 Hz filter °25C °55C Hz filter ±50 mV range ±20uV ±35uV ±10uV ±100 mV range ±40uV ±60uV ±13uV 0-5 V range ±2.5mV ±5mV ±1mV...
  • Page 50 Flex™ IO Isolated Universal Input Module IEC 60068-2-30 Relative humidity 5…95% non-condensing Vibration IEC60068-2-6: 5 g @ 10…500Hz Shock IEC60068-2-27: Operating 20 g Non-operating 25 g IEC61000-6-4 Emissions CISPR 11: Group 1, Class A (with appropriate enclosure) IEC 61000-6-2: ESD immunity 6 kV contact discharges 8 kV air discharges IEC 61000-6-2:...
  • Page 51 Appendix A: Module Specifications Certifications (when product UL Listed for Class I, Division 2 Group marked) A,B,C,D Hazardous cULus Locations, certified for U.S. and Canada. See UL File E180101. UL Listed Industrial Control Equipment, certified for U.S. and Canada. See UL File E140954. EEx European Union 94/9/EEC ATEX Directive, compliant with: EN 60079-15;...
  • Page 52 Flex™ IO Isolated Universal Input Module User's Manual Pub. 0300231-03 Rev. A...
  • Page 53 Index 1794-TB3G · 2-10 Generic Profile · 3-2 1794-TB3GS · 2-10 Hazardous Location · 2-2 A/D converter · 1-4 Input Data · 3-16 Base Unit · 2-3 Input Filter · 3-10 block diagram · 1-4 Input Type · 1-1, 3-10 Broken Input Alarm ·...
  • Page 54 Read Under Range · 3-16 Input data · 3-14 User High Alarm · 3-13, 3-16 Remote Ethernet User Low Alarm · 3-13, 3-16 Ethernet Flex Adapter · 3-4 Wiring · 2-10 Slot Number · 3-8, 3-14 Temperature Units · 3-12 User's Manual Pub.
  • Page 55 (ESD). An electrostatic charge can accumulate on the surface of ordinary plastic wrapping or cushioning material. In the unlikely event that the module should need to be returned to Spectrum Controls, please ensure that the unit is enclosed in approved ESD packaging (such as static-shielding / metallized bag or black conductive container).
  • Page 56 ©2009-2013, Spectrum Controls, Inc. All rights reserved. Specifications subject to change without notice. The Encompass logo and Point IO are trademarks of Rockwell Automation. Corporate Headquarters Spectrum Controls Inc. P.O. Box 6489 Bellevue, WA 98008 USA Fax: 425-641-9473 Tel: 425-746-9481 Web Site: www.spectrumcontrols.com...

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