Schneider Electric SR2MAN01 Manuale Utente
Implementing a Basic Application
150
SR2MAN01 11/2007
Presentation of Ladder Diagrams
Description
In this section, we will use a simple example to understand how a ladder diagram
works: A two-way switch.
works: A two-way switch.
Normal electrical diagram
Ladder diagram
The two position switches
VV1 and VV2
control turning lamp
L1 on and off.
I1 and I2 are two contacts representing inputs
1 and 2 on the smart relay.
Q1 is a coil that corresponds to output 1 from
the smart relay.
1 and 2 on the smart relay.
Q1 is a coil that corresponds to output 1 from
the smart relay.
I1-i2----------[Q1
i1-I2