Gate Functions In Measurement Modes - Siemens SIMATIC ET 200S Operating Instructions Manual

1Count5V/500kHz
3.7 Measurement Modes
3.7.9

Gate Functions in Measurement Modes

Software Gate and Hardware Gate
The 1Count5V/500kHz has two gates
• A software gate (SW gate), which is controlled by the SW_GATE control bit.
• A hardware gate (HW gate), which is controlled by means of the digital input on the
Internal gate
The internal gate is the logical AND operation of the HW gate and SW gate. Counting is only
active when the HW gate and the SW gate are open. The STS_GATE feedback bit (internal
gate status) indicates this. If a HW gate has not been assigned, the setting of the SW gate is
decisive.
Gate Control
Gate control by means of the SW gate only
The opening/closing of the SW gate starts/stops measurement.
If the SW gate is opened in isochrone mode in bus cycle "n" by setting the SW_GATE control
bit, measurement starts at time T
Gate control by means of the SW gate and HW gate
The opening and closing of the SW gate with the HW gate open starts/stops measurement.
The opening and closing of the HW gate with the SW gate open starts/stops measurement.
The SW gate is opened/closed by means of the control interface with the SW_GATE bit.
The HW gate is opened/closed by means of a 24-V signal on the digital input.
In isochrone mode, when the SW gate is open, measurement starts at time T
after the HW gate has opened. The measurement ends at time T
after the HW gate has closed.
When the HW gate is open, the measurement starts at time T
the SW has opened, and ends at time T
gate has closed.
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The software gate can only be opened by a positive edge of the SW_GATE control bit. It
is closed when this bit is reset. Note the transfer times and run times of your control
program.
1Count5V/500kHz. You assign the hardware gate as the function of the digital input
(Function DI "HW gate"). It is opened on a positive edge at the digital input and closed on
a negative edge.
in cycle "n+1".
i
in the cycle, which occurs immediately after the SW
i
Operating Instructions, 02/2007, A5E00124867-05
, immediately
i
, which occurs immediately
i
in the cycle, immediately after
i
Technological Functions