The series of graphics language and textual language defined in IEC61131-3 standard, take a great of convenience to not only the system integration manufacturers and system engineers but also the direct users.

• 它定义的一系列图形化语言和文本语言,不仅对系统集成商和系统工程师的编程带来很大的方便,而且对最终用户同样会带来很大的方便。