Reliability, Safety 2.5.1 Project planning and Installation ѕ 24 V DC power supply: Generate as electrically safely separated low voltage. Suitable devices are, for example split transformers constructed in compli- ance with European Standard EN 60742 (corre- sponds to VDE 0551). ѕ In case of power breakdowns or power fades: the program structure is to ensure that a defined state at restart excludes all dangerous states. ѕ Emergency switch-off installations must comply with EN 60204/IEC 204 (VDE 0113). They must be effec- tive at any time. ѕ Safety and precautions regulations for qualified appli- cations have to be complied with.
ѕ Please pay particular attention to the notes of warn- ing which, at relevant places, will make you aware of possible sources of dangerous mistakes or faults. ѕ Relevant standards and VDE regulations are to be complied with in every case. ѕ Control elements are to be installed in such a way as to exclude unintended operation. ѕ Control cables are to be layed in such a way as to exclude interference (inductive or capacitive) which could influence controller operation or its functionality. E 327 GB 17 10.06.2003