Under $100 and software is free: https://www.automationdirect.com/adc/shopping/catalog/programmable_controllers/click_plcs_(stackable_micro_brick)/plc_units/c0-

Under $100 and software is free: https://www.automationdirect.com/adc/shopping/catalog/programmable_controllers/click_plcs_(stackable_micro_brick)/plc_units/c0-00dd2-d https://www.automationdirect.com/adc/shopping/catalog/progra... With Ethernet that supports both Modbus TCP and Ethernet/IP, two very standard industrial protocols*: https://www.automationdirect.com/adc/shopping/catalog/programmable_controllers/click_plcs_(stackable_micro_brick)/plc_units/c0-10dd1e-d https://www.automationdirect.com/adc/shopping/catalog/progra... Note: I *HATE* EIP but we're stuck with it in the USA.*