Redundant user program with function block air conditioning
CALL FB 101,DB5 //Call of FB 101 'SWR_ZYK' with instance DB
DB_WORK_NO :=DB1 //Work DB for SWR
CALL_POSITION :=TRUE //Call_Position =TRUE at begin of redundant program
RETURN_VAL :=MW6 //Block return value
EXT_INFO :=MW8 //Extended information
A DB5.DBX 9.1 //Check if station is Master
JC M001
//redundant user program
是作什么用的?谢谢
S7-300