The Controllino range is composed of three models: the Mini, Maxi and Mega, each of which is aimed at meeting different levels of application requirement and complexity. All models, developed and implemented using the Arduno open source platform, are based on the ATmega microcontroller from Atmel and have a clock speed of 16 MHz. Key features include a direct processor contact with 4000 V ESD protection across all pins, a range of interfaces including SPI, I²C, RS-232, RS-485, and an internal real-time clock that can be switched on and off. A front-panel USB port supports simplified external programming.
The Mini offers a multitude of different inputs and outputs (6x relays outputs, 8x analog/digital inputs and 8x digital outputs) in a compact package. The Maxi offers greater flexibility (10x relays outputs, 12x analog/digital inputs and 12x digital outputs) with the addition of an Ethernet connecter and a second UART interface.
The highest specification unit is the Mega, which is capable of handling a current of up to 30 A and offers 16x relays outputs, 24x analog / digital inputs, 12x high side switch digital outputs and furthermore 12x half-bridge digital outputs.
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This instalment of the Loop Signature series introduces frequency plot theory as a foundation for understanding process dynamics, explaining Bode plots, dynamic gain, phase lag and their relationship to control loop tuning.
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