control and automotion selection guide
150Pages

Solutions Guide

Control and Automation Solutions Guide A message from the Senior Vice President, Industrial and Medical Solutions Group Dear Customers, Over 28 years ago Maxim was founded with the goal of providing high-quality integrated circuits for the industrial marketplace. We have continued to build on that industrial foundation, with more than 28% of our $2.5 billion in revenue now coming from industrial products. Our original mission has never wavered. We deliver robust, innovative solutions that add value to the products designed and built by our customers. This Control and Automation Solutions...

ii Control and Automation Solutions Guide

Table of Contents Programmable Logic Controllers (PLCs) Environmental Automation 3 Overview 83 Overview 6 Analog Input Functions Featured Products 85 Elements of Environmental Automation Systems Featured Products 12 Analog Output Functions Featured Products 95 Building Energy Measurement and Management Featured Products 21 Digital I/O Functions Featured Products 102 Control Systems Featured Products 24 Fieldbus Functions Featured Products 109 Recommended Solutions 30 CPU Functions 31 Nonisolated and Isolated Power-Supply Functions Featured Products 117 Overview Featured Products 37...

iv Control and Automation Solutions Guide

Programmable Logic Controllers (PLCs) 1

2 Control and Automation Solutions Guide

Overview Introduction Programmable logic controllers (PLCs) have been an integral part of factory automation and industrial process control for decades. PLCs are dedicated computers that have an architecture designed to accommodate control functions. They control a wide array of applications from simple lighting functions to environmental systems to complete chemical processing plants. These systems perform many functions, providing a variety of analog and digital input and output interfaces, signal processing, data conversion, and various communications protocols. The architecture of a PLC...

Basic Process Control How simple can process control be? Consider a common household oven. The oven’s components are enclosed inside one container, so no long distance communication is necessary. When the user sets the thermostat to the desired temperature, the oven maintains the internal temperature at the set point. When the thermostat setting senses that the oven temperature is low, the switch is closed, completing the circuit to open the gas valve to the main burner. Once the thermostat detects that the oven has reached the set point, the switch opens, the gas valve closes, and the main...

PLC Design Goals Robustness Communications PLCs are expected to work flawlessly for years in industrial environments that are hazardous to the very microelectronic components that give modern PLCs their excellent flexibility and precision. No mixed-signal IC company understands this better than Maxim. Since our inception, we have led the industry with exceptional product reliability and innovative approaches to protect high-performance electronics from real environmental dangers, including high levels of ESD, large transient voltage swings, and EMI/RFI. Designers have long embraced Maxim’s...

Analog Input Functions Overview The analog input portion of a PLC accepts analog signals from a variety of sensors via factory or field wiring. These sensors are used to convert physical phenomena (such as light, temperature, pressure, proximity, sound, gas, or vibration) into electrical representations. In the analog-input signal path, signals are conditioned for maximum integrity, range, and resolution before being sampled by the analog-to-digital converters (ADCs). The analog input module receives many different signals in the tough industrial environment. It is, therefore, essential to...

Applications that require extraction of phase information between channels are well suited for multiple ADCs or simultaneous-sampling multichannel ADCs. Although PLCs are used in distinct ways, many PLC designs share some common factors. For example, ADCs and DACs used in process-control systems range from 10 to 16 bits with 16 bits being one of the most common resolutions. Maxim offers many choices from 10-bit to 24-bit ADCs for a wide range of input voltages. This broad product offering is a distinct advantage for the PLC designer. For precise systems, ADCs (and DACs) require an accurate...

Featured Products Eliminate External Overvoltage Protection (OVP) Circuitry and Reduce BOM Complexity with High-Voltage Multiplexers Benefits MAX14752/MAX14753 The MAX14752/MAX14753 are 8-to-1 and dual 4-to-1, respectively, high-voltage analog multiplexers designed for high-voltage PLC applications. Both devices operate with dual supplies of ±10V to ±36V or a single supply of 20V to 72V, and a low 0.03Ω (typ) RON flatness. Logic levels for the channel-select interface are defined by the EN input to help interface with multivoltage systems. The MAX14752/ MAX14753 are packaged in the standard...

Improve Accuracy with Precision Over Time and Precision Over Temperature from UltraHigh-Precision Op Amps MAX44251/MAX44252* The MAX44251/MAX44252 are 20V, ultra-precision, low-noise, low-drift amplifiers that offer near-zero DC offset and drift through the use of patented autocorrelating zeroing techniques. This method constantly measures and compensates the input offset, thereby eliminating drift over time and temperature, and the effect of 1/f noise. 10V MAX44251 MAX44252 REFERENCE 10V BUFFER 10V VIN+ RF RG VREF ADC 16-BIT RF VIN- Benefits • Maintain system calibration and accuracy over...

16-Bit ADC with Software-Programmable Input Ranges on Each ADC Channel Saves Design Time Benefits MAX1300*/MAX1301, MAX1302*/MAX1303 The MAX1300/MAX1301/MAX1302/MAX1303 ADC family is an ideal fit for PLC applications because they measure many unique unipolar and bipolar input ranges, all with 16-bit operation and no missing codes. The eight single-ended or differential-input ranges vary as low as a unipolar 0 to 2.048V full scale up to a bipolar ±12.288V full scale. Each input channel can be programmed by software for a different input range, making the MAX1300 family highly versatile. By...