SIEMENS S7-300 PLC Subroutines

Description
This fully narrated learningSNIPPET will quickly show you how to create a subroutine for SIEMENS S7-300 PLC's, using Step7 software.

Application Focus
We have several hydraulic units that need to be monitored by the PLC, and action taken when faults occur. Each hydraulic unit requires monitoring of three critical signals, these are; High Temperature, Low Pressure and Plugged Filter.

Any one of these three signals must stop the hydraulic unit immediately. A hydraulic unit must not be allowed to start when a fault is detected, until the fault has been acknowledged. To meet all the application requirements, we would also program an input signal to acknowledge/reset faults and a single output signal that can be used as an interlock to shut down the faulty hydraulic unit.

What you learn
At the end of this application learningSNIPPET, you will;

• Learn the steps required to create a subroutine
• Understand the program components used to support the subroutine
• Know how to create and distinguish internal program variables
• Know how to create the subroutine logic
• Know how to install a CALL function to call the subroutine from the main program
• Know how to pass real I/O to the called subroutine

Benefits

• Apply new knowledge to other applications
• Use application learningSNIPPET as much as many times as you like
• Anytime, anywhere
• Helps you learning and improve your skills, without process interference