Eaton ELC-PB - 1.5 Ladder Logic Symbols

1. ELC Concepts
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1-5
1.5 Ladder Logic Symbols
The following table displays the list of ELCSoft program symbols, along with their description,
command, and memory registers that use them.
Ladder Diagram
Structure
Explanation Instruction Available Devices
NO (Normally Open)
contact / A contact
LD X, Y, M, S, T, C
NC (Normally Closed)
contact / B contact
LDI X, Y, M, S, T, C
NO contact in series
AND X, Y, M, S, T, C
NC contact in series
ANI X, Y, M, S, T, C
NO contact in parallel
OR X, Y, M, S, T, C
NC contact in parallel
ORI X, Y, M, S, T, C
Rising-edge trigger
switch
LDP X, Y, M, S, T, C
Falling-edge trigger
switch
LDF X, Y, M, S, T, C
Rising-edge trigger in
series
ANDP X, Y, M, S, T, C
Falling-edge trigger in
series
ANDF X, Y, M, S, T, C
Rising-edge trigger in
parallel
ORP X, Y, M, S, T, C
Falling-edge trigger in
parallel
ORF X, Y, M, S, T, C
Block in series
ANB None
Block in parallel
ORB None