Siemens Simatic S7-1500 Manual page 53

Setting and changing the output value (frequency)
You set the frequency with the OUTPUT_VALUE directly with the control program in the
control interface. The value is specified in the real format and the unit is always "Hz". The
possible range depends on the parameter "High-speed output (0.1 A)" as follows:
● High-speed pulse output deactivated
– Frequency (OUTPUT_VALUE) 0.1 Hz to 10,000 Hz
● High-speed pulse output activated
– Frequency (OUTPUT_VALUE) 0.1 Hz to 100,000 Hz
● Standard output (100 Hz output)
– Frequency (OUTPUT_VALUE) 0.1 Hz to 100,000 Hz
The new frequency is applied at the start of the next period. The new frequency has no
impact on the falling edge or the pulse-cycle ratio. However, the application can take up to
10 s depending on the previously set frequency.
Accuracy of the output frequency
The configured output frequency is output with a frequency-dependent accuracy at the digital
output PWM DQA. You can find an overview of the accuracy as a function of the frequency
used in the section Interconnection overview of outputs (Page 100).
Parameters of the frequency output mode
Category Parameter
Reaction to Reaction to CPU
CPU STOP STOP
Substitute value
for pulse output
(DQA)
CPU 1512C-1 PN (6ES7512-1CK00-0AB0)
Manual, 09/2016, A5E35306440-AB
Meaning
The parameter "Output substitute
value" generates a substitute
value upon CPU STOP, which you
can define with the parameter
"Substitute value for pulse output
(DQA)".
The parameter "Continue opera-
tion" still generates the frequency
output signal upon CPU STOP,
which was generated before the
CPU STOP.
If you have set the option "Output
substitute value" for "Reaction to
CPU STOP", the parameter "Sub-
stitute value for pulse output
(DQA)" defines the substitute
value to be used for the pulse
output of the channel.
If you have set the option "Contin-
ue operation" for "Reaction to CPU
STOP", the parameter "Substitute
value for pulse output (DQA)"
cannot be selected.
Technology functions
3.2 Pulse generators
Value range
Output substitute value
Continue operation
0
(use substitute value 0)
1
(use substitute value 1)
Default
Output substi-
tute value
0
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