Appendix A • Abbreviations
Appendix A
Power Panel 500 user's manual V1.40
301
6 Abbreviations
Abbreviation
Stands for
Description
Normally closed
A normally closed relay contact
NC
Not connected
Used in pinout descriptions if a terminal or pin is not connected to a module
ND
Not defined
In data tables, this stands for a value that has not been defined. This may be be-
cause a cable manufacturer does not provide certain technical data, for example.
NO
Normally open
A normally open relay contact
TBD
To be defined
Used in technical data tables when certain information is not yet available. The
value will be provided later.
Table 221: Abbreviations in this user's manual