Obsolete instruction
Subtracts time data (2 words) specified by s2 from the date/clock data (3 words) specified by s1 if the trigger EN is in the ON-state. The result is stored in the area (3 words, same format than s1) specified by d. All the data used in the F158 _CSUB instruction are handled in form of BCD.
This instruction (or variable) is allowed to be compiled because of the down-compatibility to lower versions but cannot be selected in the "Instructions" pane (or "Variables" pane) anymore.