Siemens SIMATIC NET PROFIBUS - Manual (Page 324)

Installing Network Components in Cubicles
E-4
PROFIBUS Networks SIMATIC NET
6GK1970-5CA20-0AA1 Release 2 05/2000
Note
Regardless of the degree of protection of the casing, the electrical and optical
ports are always sensitive to
– mechanical damage
– damage caused by electrostatic contact discharge
– contamination by dust and fluids
Close unused ports with the supplied dust protection caps. Remove these caps
only immediately before connecting up the cables to the ports.
Standards
EN 60529:1991 Degrees of protection provided by casing (IP code) (IEC
60529:1989)
EN 60529:1989 Degrees of protection provided by enclosures (IP Code)
Further Literature
Klingberg, G.; Mähling, W.: Schaltschrank– und Gehäuse–Klimatisierung in der
Praxis mit EMV; Heidelberg 1998