The scenario
Automatic control of fill and empty valves for a tank, using low and high level switches, with emergency stop functionality.
What is in this drawing
Read the decisions behind it.
01
Use of seal-in circuits to latch valve states
02
Separate rungs for fill and empty control
03
Inclusion of emergency stop contacts
When designing PLC ladder logic for tank level control applications requiring independent fill and empty valve operation.
More like this