Siemens SIMATIC ET 200S Operating Instructions Manual page 142

1Count5V/500kHz
3.6 Count Modes
Synchronization with DI and Zero Mark
In order to be able to use this function, you must have selected it from the digital input
function parameters.
Figure 3-12 Once-Only and Periodic Synchronization
If you have assigned synchronization with DI and zero mark, the DI serves as the HW
enable. When the HW enable is active, the 1Count5V/500kHz is loaded with the load value
by the zero mark of the encoder.
You can select between once-only and periodic synchronization.
142
Technological Functions
Operating Instructions, 02/2007, A5E00124867-05