PROFIBUS cables are especially made for process automation (PA) systems. PROFIBUS is standardised acc. to IEC 61158 that means best interoperability of components from different manufactures. The modular peripheral construction (DP: decentralised periphery ) of the bus system simplifies installation and maintenance. The PROFIBUS type A is generally used in current systems, cables of PROFIBUS type B are only used for replacement purpose in already existing systems.