Cheap And Discounts Coolmay 40DI 40DO 2*RS485 PLC controller support WORKS 2 programming EThernet port optional funtion maximum 16 analog optional Wholesale. Buy Directly From Merchant Coolmay-PLC Store. Enjoy ✓Free Shipping Worldwide! ✓90 Days Buyer Protection. ✓Easy Return. ✓Money Back Guarantee.