2008

Table Of Contents
Components - General
Schematic components such as relays, switches, pilot lights, and discrete motor
control devices (but not PLC I/O symbols) follow this naming convention:
32-character block name maximum, first character is either "H" or "V" for
horizontal or vertical wire insertion.
The next two characters are reserved for family type (for example, PB for
push buttons, CR for control relays, LS for limit switches). A zero (0) as the
second character of the family type (for example, a 0 in the overall symbol
name) means that the symbol does not trigger a wire number change
through it (for example, T0 for terminals, W0 for cable markers, C0 for
connectors).
The fourth character is generally a 1 or a 2: 2 for child contacts and 1 for
everything else (parent or standalone component).
If the symbol is a contact, then the 5th character is a 1 for normally open,
2 for normally closed.
The remaining characters are not specified. They are used to keep names
unique.
Examples:
Control relay coil, horizontal rung insertionHCR1.dwg
Control relay coil, vertical rung insertionVCR1.dwg
Horizontal relay contact, N.O.HCR21.dwg
Horizontal relay contact, N.C.HCR22.dwg
Horizontal relay contact, N.C., with in-line terminal numbersHCR22T.dwg
Vertical push button, parent contact, N.O.VPB11.dwg
Vertical push button, child contact, N.O.VPB21.dwg
Horizontal limit switch, parent, N.O.HLS11.dwg
164 | Chapter 4 Symbol Libraries