IF FILTER_HMI_COMMAND[7].0 THEN
FILTER_HMI_R[7].0:=1;
FILTER_HMI_R[7].1:=0;
FILTER_HMI_R[7].2:=0;
END_IF;
IF FILTER_HMI_COMMAND[7].1 THEN
FILTER_HMI_R[7].0:=0;
FILTER_HMI_R[7].1:=1;
FILTER_HMI_R[7].2:=0;
END_IF;
IF FILTER_HMI_COMMAND[7].2 THEN
FILTER_HMI_R[7].0:=0;
FILTER_HMI_R[7].1:=0;
FILTER_HMI_R[7].2:=1;
END_IF;
IF (NOT FILTER_HMI_R[7].0) AND (NOT FILTER_HMI_R[7].1) AND (NOT FILTER_HMI_R[7].2) THEN
FILTER_HMI_R[7].1:=1;
END_IF;

你的这个是什么品牌的PLC？

ABB公司的

用scl语言编写的不一定能转成LAD图形，结合你的实际，慢慢理解吧，