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ControlLogix analog input module - Fall 09

ControlLogix analog input module - Fall 09 - MFET 474...

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MFET 474, Manufacturing Integration II 8/24/2009 ControlLogix Analog Inputs 1 MFET 474 Fall 2009 Working with ControlLogix Analog Inputs T.E. Kostek Topics d Introduction 1756-IF16 specifications Acquiring data 1756-IF16 features 2 Wiring sensors to the 1756-IF16
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MFET 474, Manufacturing Integration II 8/24/2009 ControlLogix Analog Inputs 2 Introduction Introduction All C t lL i I/O d l t b All ControlLogix I/O modules must be configured I/O modules are “placed” in the I/O Configuration folder before they can be used. Block transfer instructions are NOT used! 4 This presentation will focus on the 1756-IF16 analog input module
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MFET 474, Manufacturing Integration II 8/24/2009 ControlLogix Analog Inputs 3 Introduction D l d h 1756 IF16’ l Download the 1756-IF16’s users manual from Allen-Bradley’s web site and place it your lab group folder. Publication 1756-UM009B-EN-P-June 2003 5 1756-IF16 Specifications
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MFET 474, Manufacturing Integration II 8/24/2009 ControlLogix Analog Inputs 4 1756-IF16 Specifications Th 1756 IF16 t th f ll i The 1756-IF16 supports the following types of analog inputs: Single-ended or differential 16 single-ended inputs, or 8 differential inputs, or 7 4 high-speed differential inputs Voltage or current 1756-IF16 Specifications The 1756-IF16 supports the following input The 1756 IF16 supports the following input ranges: ±10.25 volts Generally ± 10v 0 to 5.125 volts Generally 0-5v 8 0 to 10.25 volts Generally 0-10v 0 to 20.5 ma Generally 0-20ma or 4-to-20ma
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MFET 474, Manufacturing Integration II 8/24/2009 ControlLogix Analog Inputs 5 Acquiring Data Acquiring Data In traditional systems (e g PLC 5s) the In traditional systems (e.g., PLC-5s) the controller polls the analog input module for data. Recall PLC-5s use block transfer read (BTR) instructions to read data from an analog input module. 10 input module. This is essentially a polling operation.
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MFET 474, Manufacturing Integration II 8/24/2009 ControlLogix Analog Inputs 6 Acquiring Data ControlLogix uses the ControlLogix uses the producer/consumer model The analog input module is a producer (the controller consumes the data produced by the analog input module) 11 The 1756-IF16 analog input module periodically multicasts (produces) its data to the controller. Acquiring Data Wh d th 1756 IF16 l i t When does the 1756-IF16 analog input module multicast its data? It depends on how the module is configured! It also depends if you are working with local I/O or remote I/O 12 We need to understand the following terms: RTS – R eal T ime S ample RPI – R equested P acket I nterval
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MFET 474, Manufacturing Integration II 8/24/2009 ControlLogix Analog Inputs 7 Acquiring Data – RTS During the real time sample (RTS) During the period the following occurs: Scan all of the analog inputs and store the data in the memory of the analog input module Multicast (produce) the updated channel data 13 (plus other status information) to the backplane of the local chassis Acquiring Data – RTS 1. Scan inputs 2. Store data in memory 3 Multicast (produce) 14 3. Multicast (produce) data Note: Channel numbers start at 0!
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MFET 474, Manufacturing Integration II 8/24/2009
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