Overview of channel functions
The digital channels configured as DI channels continue to operate as digital inputs regardless
of the operating mode.
The following figure shows the available functions for a channel on which the configuration of
the counter/frequency measurement operating modes is possible:
● In "Counter" mode, a 32-bit forward counter works in parallel to the digital input.
You can find information on this in the section "Counting (Page 37)".
● In "Frequency measurement" mode, a frequency measurement works in parallel to the
digital input.
You can find information on this in the section "Measure frequency (Page 45)".
10101...
HZ
DI (channel n)
Input / Terminal
STATUS DI
Counter
Frequency meter
Operating mode
Counter
Frequency measurement
Count value /
Frequency value
Channel mode DI
DI channel
Figure 5-1 Counters and frequency meters working in parallel to the digital input
Depending on the operating mode, the process picture shows the counter reading or the
frequency value.
You can find information on the process image in section "Parameters, diagnostics messages
and address space without PCS 7 (Page 194)".
You can find additional information in section "Technical specifications (Page 147)".
5.3 Counting
"Counter" mode
In "Counter" mode, a 32-bit forward counter works in parallel to the digital input. The functions
of the digital input remain available.
Operating principle in "Counter" mode
You can find information on the counter parameters in the section "Drivers, parameters,
diagnostic messages and address space (Page 193)".
Operating modes and functions
5.3 Counting
SIMATIC CFU
Commissioning Manual, 08/2019, A5E39252870-AD 37
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