SIMATIC NET communication card for laptop, correspond to Siemens 6GK1551-2AA00, optoelectronic isolated, anti-lightning and surging, suitable for laptop PCMCIA 32bit CardBus slot, is used to achieve PROFIBUS/MPI/PPI/FWL communication connection between PC and SIMATIC, communication speed is 9. 6Kbps~12Mbps. After switched over by the transition card, it can be used for desk computer and secondary generation ExpressCard slot laptop. CP5512 +(PCI-> PCMCIA) transition card, then can be used for desk computer; CP5512 + (PCMCIA(II)-> PCMCIA)transition card, then can be used for secondary generation ExpressCard slot laptop.