欧姆龙PLC中“装载LD”语句的含义及用法

如题所述

第1个回答  2011-11-12
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.
第2个回答  2011-11-12
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.

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