Question

欧姆龙PLC中“装载LD”语句的含义及用法

Answer 1

LD一般只一段程序的开始，1.看梯形图有没有输出，2.可能是直接输出输出.

Answer 2

你研究它的指令有何用，直接用梯形图不就行了。

追问

是这样的，我们这有一个PLC系统，别人编的程序，现在有一个LD 200.11，不知是何意思？然后编译时老说这一条无效助记符

追答

LD指令，邦助中一查就知道了，但不知“无效助记符”怎么办
LD - Load

Variations:
Differentiate Up

Differentiate Down

Immediate Refresh

Immediate Refresh/Differentiate Up

Immediate Refresh/Differentiate Down

Note: Immediate Refreshing is not supported by the CS1D CPU Units.

See Variations for more information.

Purpose:
Indicates a logical start and creates an ON/OFF execution condition based on the ON/OFF status of the specified operand bit.