Commissioning/Configuration
EP5xxx
83
Version: 2.3.0
Additional Notes
Frequency
• The time window for the frequency calculation and the resolution can be parameterized in the CoE
objects
Frequency window
0x8000:11,
Frequency scaling
0x8000:13,
Frequency resolution
0x8000:15
and
Frequency wait time
0x8000:17.
• The positive edges of track A are counted within the specified timeframe and the next edge including
the time up to it are counted. The waiting time can be set in CoE object 0x8000:17
Frequency Wait
Time
(unit: ms). The default value is 1.6 sec. This is also the maximum value.
• The time window is 10 ms (default), min. 1 µs. With the default setting it is possible to measure
frequencies up to approx. 800 kHz. At higher frequencies a smaller value must be selected for the
timeframe.
• The time is measured with a resolution of 100 ns.
• This calculation is carried out in the slave without reference to the distributed clocks system. It is
therefore independent of the DC mode.
• No frequency measurement is possible if the counter is blocked by the gate. In this case the period can
be measured regardless.
• A C or external reset restarts the frequency measurement. The last frequency value remains
unchanged until a new frequency value is determined.
Frequency measurement
• Basic unit 1 µs: all window sizes
Measurement sequence
• The measurement starts with a positive edge at track A. The current counter value and time
(resolution: 100 ns) are stored.
• After the measuring window time has elapsed (index 0x8000:11), the system waits for the subsequent
rising edge at track A, or a maximum of 1.6 seconds, or the time from
Frequency Wait Time
0x8000:17.
• The frequency is calculated from the edge difference and the actual elapsed time.
Fig. 72: Frequency measurement principle in enhanced operation mode
Period calculation
• This calculation is carried out in the slave without reference to the distributed clocks system. It is
therefore independent of the DC mode.
• During each cycle the interval between 2 positive edges of input A is counted.
• If no edge change occurs for approx. 1.6 s, any period specification is canceled.
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