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SMART I/O User’s Manual
©1996 PEP Modular Computers GmbHMarch 12, 1996 Page 5 - 31
5
Chapter 5 Analog Modules
5.2.5 Functional Description
Figure 5.2.5.1: SM-PT100 Schematic Diagram
The SM-PT100 has provision for 4 sets of 4-wire PT100 sensors driven by
an on-board generated 400µA constant current source. The differential
analog input consists of a channel multiplexer, operational amplifier voltage
feedback impedance converter and a high-resolution 16-bit delta-sigma
converter. 1000V DC system isolation is provided by an optoisolated DC/DC
converter while system flexibility is provided by a 256 bytes of serial
EEPROM for ID number, production and board-specific calibration data.
Two front-panel LEDs show the conversion/calibration activity.
The PT100 is a platinum resistance, which at 0ºC has a resistance of 100Ω
and conforms to the international DIN IEC 751 standard for Industrial
Platinum Resistance Thermometer Sensors. Two classes A and B exist under
this standard with class B experiencing a slightly worse initial error.
Figure 5.2.5.2 Supported Sensor Connections
Multiplexer
A/D
Converter
System
Interface
LED
Driver
Impedance
Converter
Serial
I/O
R
L
R
L
PT100 Sensor , 4-wire Input
CUR
IN+
IN-
AGND
400 µA
400 µA
SENSE LINE
SUPPLY LINE
SUPPLY LINE
SENSE LINE
User Interface System Interface
Pt 100/ /2
Red White
Pt 100/ /3
Red WhiteRed
Pt 100/ /4
Red WhiteRed Red
- SMART I/O User’s Manual 1
- Revision History 4
- Two Years Warranty 7
- Page 0 - 10 10
- 5. Analo 11
- Table of Contents 13
- Introduction 14
- General Information 15
- Weights & Measures 16
- 1.1 Product Overview 20
- 1.2 Ordering Information 21
- 1.3 Product Information 22
- 1.4 Installation 25
- SMART-Module 27
- RJ45 Connector 28
- SMART-BASE 28
- 1.5 ISaGRAF-Installation 30
- Chapter 2 SMART-BASE 42
- 2. SMART-BASE 43
- 2.1 Specifications 44
- 2.2 Board Overview 45
- 2.3 Functional Description 46
- Interrupt 47
- 2.4 Configuration 48
- WARNING ! 49
- 2.6 ‘C’ Programming 57
- 2.7 ISaGRAF Programming 72
- 2.8 Flash Utility 77
- Table Of Contents 79
- Chapter 3 SMART-EXT 80
- 3. SMART-EXT 81
- 3.2 Board Overview 82
- 3.3 Functional Description 83
- 08 Jan. 98 91
- 4. Digital Modules 93
- Green LEDs 94
- Chapter 4 Digital Modules 100
- 4.2 SM-DOUT1 107
- Warning ! 109
- 4.3 SM-REL1 121
- Chapter 4 Digital Modules 122
- Gnd (0V) 125
- +Vcc (24V) 125
- Digital Modules 137
- 4.4 SM-ACI1 139
- WARNING! 147
- Analog Modules 157
- SMART I/O 157
- Chapter 5 Analog Modules 159
- 5. Analog Modules 163
- Red LEDs 164
- User Descriptor 164
- 5.2 SM-PT100 185
- 5.3 SM-THERM 215
- 5.4 SM-ADC1 245
- Impedance 246
- Converter 246
- 5.5 SM-DAC1 263
- 12-bit value 274
- Communications Modules 283
- 6. Communications Modules 287
- Green LED 288
- Yellow LED 288
- Transceiver 289
- Connection 291
- Interface 291
- 6.2.3 Front Panel Layout 300
- 6.2.4 Board Overview 300
- Component Side 300
- Comp. Value 301
- (24-bit) 301
- October 01, 1996 302
- Page 6- 20 302
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