Programming
46 © Festo Didactic GmbH & Co. • MPS
Please edit the PLC-program concerning the following description:
as long as a Start-button AND a Reset-button are pressed, the piston rod of the
cylinder move. The cylinder is actuated by a 5/2-way single solenoid valve. Please
find out in the pneumatic plan which cylinder/actuator you gonna use.
Information
Use FC5 to edit the program. Open a new project and name it P2_02 (see screen
shots in the part Planning. We didn´t close the project P2_01, because we have to
copy the Hardwareconfiguration from this project to the new one. Use the
hardwareadresses (see list in Project 1.3) to edit the program. The programming
language in FC1 should be FBD (Function Block Diagram), in OB1 STL (Statement
List). FC1 starts unconditional (UC).
Instructor: Please explain the programming structure of a PLC (S5 or S7) with OB1,
FC, FB, SFB, SFC. Explain also the two ways to call a program (Function) from OB1
(UC and CC) Work out the Truth table, Wiring diagram, Logic plan and Stepping
diagram together with the participants. Explain that the basics on the following
pages are principal-functions (because the output is the Start-light H1). Explain
also the two different possibilities to structure a project – seen on the next page.
Show the participants how to copy a hardwareconfiguration from another project.
Explain to the participants, that the meaning of "cylinder move" is depending on
the hardware and onto the connection to the responding valve. "cylinder move"
means, from the front to the back position if the piston rod starting condition is the
front position and to the front position if the piston rod starting condition is the
back position!!!!
2.2 Programming –
Basics in Digital
Technology – AND
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