Appendix A
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X20 system User's Manual 3.10
Appendix A Abbreviations
A.1 General information
Abbreviations appear throughout this user's manual in technical data tables or descriptions of pinouts, for example.
A.2 Overview
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 1050: Abbreviations used in this user's manual
Summary of Contents for X20 System
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