RIEVTECH STUDIO SOFTWARE MANUAL The “ Add ” , “ Upper limit ” and “ Lower limit ” are all “ Constant ” in default. They can also be set into “ Variable ” . It is noted that the data type of variable register must comply with the “ Word Set ” component address type. l Subtract A designated data will be subtracted from the value of the designated word register till the “ Lower limit ” . The “ Subtract ” attributes contain the following settings. Ш Subtract At each time of operation, the set data will be subtracted from the word register. Ш Lower Limit It is the lower limit of the word register operated.
When the result reached the lower limit of operation, no further “ Subtract ” operation can be done. Ш Looping If “ Looping ” is checked, an option of “ Upper limit ” will appear. The operation will be continued at the lower limit and the subtraction will be done from the upper limit. For example, if the “ Lower limit ” is set to “ 0 ” , the “ Subtract ” is set to “ 1 ” , and the upper limit is set to “ 100 ” , the Word Set component will be valid when it is subtracted to “ 0 ” . It will turn to 100, 99, 98, 97,and so on, at the next operations. 131