Force send is a special conditional expression LSO supports. The syntax for this expression is (FORCE10) or (FORCE 10). This means that when the flag 10 table location is set to ON, LSO will send all the tags in the current list. LSO will then reset the flag 10 table location to OFF.
In the example, when FLG10 = 1 all the tags under the cycle condition will be sent whether they have changed or not. FLG10 will then be set to zero.