Siemens SIMATIC ET 200S Operating Instructions Manual page 34

1Count24V/100kHz
2.6 Count Modes
The stored count rather than the current count is indicated in the feedback interface. The
STS_DI bit indicates the status of the latch and retrigger signal.
The latch value is preassigned with its RESET state. It is not changed when the SW gate is
opened.
Direct loading of the counter does not cause the indicated stored count to be changed.
If you close the SW gate, counting is only interrupted; this means that when you open the
SW gate again, counting is continued. The digital input DI remains active even when the SW
gate is closed.
Counting is also latched and triggered in isochrone mode with each edge on the digital input.
The count that was valid at the time of the last edge before T
interface.
The Latch Function
Requirement
In order to use this function, the Function DI parameter must be set to "Latch on Positive
Edge".
Description
Figure 2-10
Count and latch value are preassigned with their RESET states.
The counting function is started when the SW gate is opened. The 1Count24V/100kHz
begins at the load value.
34
Latch with a Load Value of 0
is displayed in the feedback
i
Technological Functions
Operating Instructions, 02/2007, A5E00124867-05