PLC - General knowledge

IEC 61131 - Comprehension questions

• What is the cycle time of a task?

• What is the difference between an FB and FC?

• What is meant by multitasking?

• What standard functions (FCs) and standard function blocks (FBs) are there according to IEC? Name four examples.

• Can a function have several outputs?

• Is it possible to address directly represented variables in a function block, e.g. the input %IX6.0? What problem does this cause?

• What types of variables are there in IEC? What is the difference between global, local and direct variables?

• What data types are there in the IEC?

• How is the communication within a program?

• How is the communication between different programs?

• Which programming languages are there according to IEC 61131?

• Create an example in ST for each of the following statements: IF, CASE, FOR, and EXIT.