Siemens Simatic ET 200SP, Interface module IM 155-6PNProduct Overview The SIMATIC ET 200SP PROFINET Interface Module IM 155 6PN Standard delivers reliable distributed I O connectivity for demanding industrial automation applications requiring efficient PROFINET communication. This interface module supports up to 32 I O modules and 16 ET 200AL modules with single hot swap capabilities, providing seamless integration between PROFINET networks and ET 200SP distributed I O systems in compact control