Siemens SIMATIC ET 200S Operating Instructions Manual page 144

1Count5V
3.6 Count Modes
If you have configured synchronization, the positive edge of a reference signal on the input
sets the 1Count5V to the load value.
You can select between once-only and periodic synchronization ("Synchronization"
parameter).
The following conditions apply:
● The counting mode must have been started with the SW gate.
● The "Enable synchronization CTRL_SYN" control bit must be set.
● Synchronize once only: If the enable bit is set, the first edge loads the 1Count5V with the
● Synchronization periodically: If the enable bit is set, the first and every further edge loads
● After successful synchronization, the STS_SYN feedback bit is set and the SYN LED
● The signal of a bounce-free switch can serve as the reference signal.
● The STS_DI feedback bit indicates the level of the reference signal.
In isochronous mode, the set feedback bit STS_SYN indicates that the positive edge on the
digital input was between time T
144
load value.
the 1Count5V with the load value.
comes on. The RES_STS control bit resets the feedback bit and switches the LED off.
in the current cycle and T
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Operating Instructions, 06/2010, A5E00124867-07
in the previous cycle.
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Technological Functions