Industrial Shields M-DUINO Series PLC I/O Module, 12 → 24 V dc Supply, Digital Isolated Output Output, 21-Input,

The Boot & Work Corp S.L connectable PLC Arduino module with stored program method. It has 21 number of inputs. It uses USB only for uploading or debugging.

Combination of the cyclic scan and immediate refresh processing I/O control method
Programming language Arduino IDE
Immediate access to program with maintain and control