The Arduino-based GPRS/SIM PLC Plus from Industrial Shields is a programmable logic controller designed for professional use. Offering 17 I/Os and DIN rail mounting, the controller can be programmed using the Arduino IDE platform and expanded up to 127 modules through I2C communication, providing users as many as 7,100 inputs and outputs in controller and peripheral connections. It can be programmed through USB ports or through the Ethernet port remotely, enabling immediate access to program, maintain, control and monitor.