of a cold restart

(%S0=1) the current value is reset to zero, the outputs are set to zero and the preset value is initialized at the value defined in configuration.

of a warm restart, a change to stop, deactivation of a task or execution of a breakpoint

(%S1=1) has no effect on the current value of the counter.

of modifying the preset

A modification to the preset value by instruction or adjustment is taken into account during management of the block by the application.