Examples of specific usage of diagnostic instructions in s7-1200 and s7-1500 (led+devicestates+modulestates)

S7-1200 and S7-1500 Examples of specific usage of diagnostic instructions in （LED+DeviceStates+ModuleStates）

The diagnostic command is located at “ Instructions ”-“ Extension instructions ”-“ The diagnosis ” in .

One 、 utilize LED Command diagnosis CPU Indicator Status

LADDR：CPU Hardware identifier of ,
LED：
1 Inquire about STOP/RUN state ;
2 Inquire about ERROR state ;
3： Inquire about MAINT state ;
4： redundancy ;
5：Link（ green ）;
6：Rx/Tx( yellow )

RET_VAL: Program execution return value ;
0：LED Does not exist or the status is unavailable ;
1： Permanent ban ;
2： The green indicator light is permanently on ;
3： Orange lights permanently ;
CPU Of LADDR Address check （ Find out Common At the end of the ）, See the picture below ;