A translation method
Translation method was quite soft in the selected models of PLC devices, instead of the original schematic diagram of relay–contactor control circuit devices will translate relay–contactor control circuit of the PLC ladder program.
1. Design procedure
2. Design example
Figure 1 is a translation of the original relay–contactor control circuit using PLC control schematics and ladder diagram
B, function graph
Functional diagram also known as flow charts, is mainly aimed at sequencing control or stepper control program.
1. Design procedure
2. Design example
C, logic design method
In for programming Shi to Boolean logic Algebra for theory based, both to logic variable “0” or “1” as research object, to “and”, and “or”, and “non-” three species basic logic operation for analysis according to, on electrical control line for logic operation, put touch points of “pass, and broken” State with logic variable “0” or “1” to said has more variable of “and” logic relationship expression type can directly into for touch points over of trapezoidal figure. Figure 2 (a) as shown.
With multiple variables “or“ logical expressions can be converted directly into contact parallel ladder diagrams. Figure 2 (b) as shown.
With multiple variables “or“, “or“ logical expressions can be converted directly into contact-parallel ladder diagrams. Figure 2 (c) as shown.
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