Arduino IS.AB20AN.HF ARDBOX Analog 20 I/Os PLC Industrial Shields Arduino IS.AB20AN.HF ARDBOX Analog 20 I/Os PLC offers 20x digital inputs/outputs, 10x analog inputs, and 10x digital or analog outputs. The IS.AB20AN.HF PLC provides a master-slave connection using I2C as communication between two computers. The device supports Arduino LEONARDO allowing USB programming. This feature makes the IS.AB20AN.HF ARDBOX analog PLC have immediate access to program, maintain and prepare it for set up, permitting users control of equipment without limits.