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Q18: C language advantages compared to ladder chart?
A18:
(1) XD/XL series PLC supports almost all C language functions. When it comes to complex
mathematical operations, the advantage of C language is more obvious.
(2) Enhance the confidentiality of the program (when using file-advanced storage mode, C
language can not upload);
(3) C language function block can be called in many places and different files, which greatly
improves the efficiency of programmers.
Q19: What’s PLC output terminal A, B
？
A19:
PLC output terminal A, B are RS485 terminals of PORT2 on PLC.
Q20: What’s the difference of sequence function BLOCK trigger
condition: rising edge triggered and normally closed conduction?
A20:
Rising edge triggered: when the condition is triggered, block executes in order from top to
bottom; Normally closed conduction: when the condition is triggered, Block will execute in
order from top to bottom, return to the top and execute again until the normally closed
conduction breaks off. The cycle stops when the last one finished.
From up to down, run the instruction from up to down, cyclic run the instruction
one by one
Q21: What are the download modes of XD/XL series PLC and what
are their characteristics?
A21:
XD/XL series PLC has three download modes, which are:
Common download mode
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