Reliability, Safety 2.5.5 External electrical influences Connect the control system to the protective earth conductor to eliminate electromagnetic interference. Ensure practical wiring and laying of cables. 2.5.6 Cable routing and wiring Separate laying of power supply circuits, never together with control current loops: Ш DC voltage 60 V ... 400 V Ш AC voltage 25 V ... 400 V Joint laying of control current loops is allowed for:
Ш shielded data signals Ш shielded analogue signals Ш unshielded digital I/O lines Ш unshielded DC voltages Ш unshielded AC voltage 2.5.7 Location of installation Make sure that there are no impediments due to temperatures, dirt, impact, vibration and electromagnetic interference. Temperature Consider heat sources such as general heating of rooms, sunlight, heat accumulation in assembly rooms or control cabinets. 15