Eaton XNE-2CNT-2PWM, Руководство пользователя

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4 Functions of the count inputs (CNT1 and CNT2)
4.1 Basic functions of the count inputs CNTx
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XI/ON: XNE-2CNT-2PWM 04/2011 MN05002035Z-EN www.eaton.com
The internal enable is reset automatically when a count limit is reached and STS_CNTx_RUN
is set = 0. In this case, with CNTx_ENABLE = 1 being active, a counter restart is executed
through first setting bit CNTx_GENERAL_DISABLE to "1" and then resetting it to "0".
4.1.8 Method of counting: periodical counting
If, in the Process output / control interface (page 32), periodical counting is activated via
CNTx_SINGLE =
0 , the counter reacts as follows depending on the main count direction
defined (Parameter data of the module (page 25)).
Table 10:
Main count
direction with
CNTx_SINGLE
=
0
Main count direction CNTx
Bit 1 Bit 0
0 0
Ba
sic fun
ction
Load value The counting operation starts with the current count value.
Upper
count limit If, while counting upwards, the counter reaches the upper count limit and
another counting pulse is received, the counter value jumps to the lower count
limit. The counter continues counting starting at the lower count limit.
Lower
count limit If, while counting downwards, the counter reaches the lower count limit and
another counting pulse is received, the counter value jumps to the load value.
The counter continues counting starting at the load value.
Internal enable The internal enable is not automatically reset. The counter remains active.
0 1
No
ne
Load value The counting operation starts with the current count value.
Upper
count limit If, when counting upwards, the counter reaches the upper count limit and
another counting pulse is received, the counter value jumps to the load value
and continues counting.
Lower
count limit If, when counting downwards, the counter reaches the lower count limit and
another counting pulse is received, the counter value jumps to the load value
and continues counting.
Internal enable The internal enable is not automatically reset. The counter remains active.
1 0
Up
Load value The counting operation starts with the current count value.
Upper
count limit If, while counting upwards, the counter reaches the upper count limit and
another counting pulse is received, the counter value jumps to the load value.
The counter continues counting starting at the load value.
Lower
count limit If, while counting downwards, the counter reaches the lower count limit and
another counting pulse is received, the counter value jumps to the upper count
limit. The counter continues counting starting at the upper count limit.
Internal enable The internal enable is not automatically reset. The counter remains active.