Momentum Modbus Plus 170 PNT Series Guia do Utilizador Página 338

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Ladder Logic Elements and Instructions
326
870 USE 101 00 V.2.2
Standard Ladder Logic Elements
Introduction
This section provides a glossary of standard ladder logic symbols and instructions.
Ladder Logic
Symbols
The table below provides the meaning of standard ladder logic symbols.
Continued on next page
Symbol Meaning Nodes Consumed
Normally open (N.O.) contact 1
Normally closed (N.C.) contact 1
Positive transitional (P.T.) contact 1
Negative transitional (N.T.) contact 1
Normal coil 1
Memory-retentive or latched coil; the
two symbols mean the same thing, and
the user may select the preferred
version for online display.
1
Horizontal short 1
Vertical short 0
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