Question

Provide answers for the following
a) list the limitations and issues of earlier plc languagess before IEC 61131-3 Came into play.
a) explain how inter language portability difgers from inter system portability, when dealing with plcs

Answer 1

(a)Limitation of Earlier PLC language before IEC

• For different brands of integrated development environment different function blocks,input and outputs are used.
• Engineers are unable to understand these early logic quickly about the program flow from any manufactures software.
• Consistency in software product is less compared to IEC.

(b)How inter language portability differ from inter system portability

• Inter language portability facilitates  code review and maintenance by permitting the code to be viewed in any language.
• Inter system portability porting program from one hardware to another.