Utilisateur
Programmerbar logisk styrenhet
Ladderdiagram
Automatisering av industriella processer
Relä eller transistorutgång
Ingångssignaler och utgångssignaler
Att hantera kommunikation mellan PLC och externa enheter
Digitala och analoga ingångar
En signal som kommer in i systemet
En signal som går ut från systemet
I/O-modul
Using an output address as an input in a program
In the previous chapter, we learned that an output address can be used as an input address (NC or NO contact) in the rules for ladder diagram programming.
The following example shows an output address (Q0.2) being used for an input.
Using the SET and RESET instructions
The SET and RESET instructions are two important instructions used in ladder diagram programming. They are both output (coil/assignment) instructions.
The SET coil is energized when power is supplied to it via an input (switch, sensor, or push button) and it remains SET (ON) even when the switch, sensor, or push button that supplied power to it is OFF until it is reset.
SCADA system helps to collect, analyze, and visualize data from equipment or a machine and also provides a means of controlling the equipment or machine from a central location, which can be local or remote (that is, near the machine or far away from the machine).