PLC for Pressing machine A Pneumatically operated pressing m

PLC for Pressing machine: A Pneumatically operated pressing machine is used to emboss aluminum sheets. Sheet to be embossed is placed on the base and it should be covered by means of protection cage for safety purposes. Schematic diagram is given as bellow. Press with protection cage Yo 2 * D. S1 Start . Protection cage sensor • Construct a symbol table for PLC. • Build up a PLC program in function block diagram suited to the above operation. • Modify the above operation in such away that the piston hold about 10 seconds after its extension to get finishing quality of sheets. • Draw Tet minal Diagram for the athve ,

Solution

Proposed in the paper is an automated procedure to construct a plant model for PLC simulation. Since PLC programs only contain the control logic without the information on the plant model, it is necessary to build the corresponding plant model to perform simulation. Conventionally, a plant model for PLC simulation has been constructed manually, and it requires much efforts as well as the in-depth knowledge of simulation. As a remedy for the problem, we propose an automated procedure to generate a plant model from the symbol table of a PLC program. To do so, we propose a naming rule for PLC symbols so that the symbol names include enough information on the plant model. By analyzing such symbol names, we extract a plant model automatically. The proposed methodology has been implemented, and test runs were made.