For many plant operators, the continual pressure to improve operations while reducing downtime is partly solved by the use of function blocks for PLC programming. “Function blocks give you time ...

Although these complex tasks probably could be programmed with combinations of the standard instructions, PLC manufacturers have introduced function blocks to make programming some of the more common ...

That’s why it’s often used for PID loops. There are also several safety systems that use Function Blocks as their programming method, he added. The main takeaway when looking at the different PLC ...

a more structured programming approach is taken with the use of “tags,” which are stored within the PLC’s memory in a tag database. With a Tag Database, all function blocks, including contacts, coils, ...

Figure 5b: program ValveV1Control in ST In any PLC, reading inputs from physical I/O cards is unavoidable. The ReadAnalogIn function block in FBD is shown in figure 7. Figure 7: function block ...