MAXREFDES61#: 16-bit, four-channel analog input micro PLC card

Overview

Industry 4.0 marks the fourth industrial revolution, which is characterized by distributed and intelligent control systems. Industry 4.0 gets rid of the bulky, centralized programmable logic controllers of the past , allowing factories to be highly configurable and modular, supporting a significant increase in the number of sensor inputs and higher output than before. Ultra-small size PLC, or micro PLC, is the core of the Industry 4.0 factory, providing high performance and extremely low power consumption in an extremely small size package. MAXREFDES61# is Maxim's micro PLC, four-channel analog input card.

MAXREFDES61# features 16-bit high-precision, four-channel analog input, power and data isolation. Two of the input channels support -10V to +10V voltage signals, and the other two input channels support 4mA to 20mA current signals. The MAXREFDES61# design integrates a dual-channel, low-noise, low-distortion buffer (MAX9633); a 16-bit, 4-channel, multi-range input ADC (MAX1301); and two high-voltage, 4–20mA current protectors (MAX14626) for current Input channels; ultra-high-precision 4.096V voltage reference (MAX6126); 600VRMS data isolation (MAX14850); STM32F4 microcontroller; FTDI USB-UART bridge; high-efficiency DC-DC converter (MAX15062); and isolation/regulation +15V, +5V and -3V supplies (MAX17498C/MAX8719/MAX1659/MAX1735). The power consumption of the entire system is typically less than 500mW, making it suitable for use in a space the size of a credit card. When used in industrial and micro PLC fields, MAXREFDES61# can be used in any application that requires high-precision analog-to-digital conversion. Figure 1 shows the system block diagram.

Figure 1. MAXREFDES61# reference design block diagram.

characteristic

• High precision

• -10 to +10V ±20% voltage input

• 4 to 20mA +20% current input

• Isolate power and data

• Micro PLC specifications

• Device driver

• C language source code example

• Test Data

application

• Industrial control and automation

• process control

• PLC