Technology functions
3.2 Pulse generators
CPU 1512C-1 PN (6ES7512-1CK00-0AB0)
Manual, 09/2016, A5E35306440-AB
45
With pulse width modulation, a signal with defined cycle duration and variable on-load factor
is output at the digital output. The on-load factor is the relationship of the pulse duration to
the cycle duration. In PWM mode, you can control the on-load factor and the cycle duration.
With pulse width modulation you vary the mean value of the output voltage. Depending on
the connected load, you can control the load current or the power with this.
You can specify the pulse duration as one-hundredth of the period duration (0 bis 100), as
one-thousandth (0 to 1000), as one ten-thousandth (0 to 10,000) or in S7 analog format.
The pulse duration can be between 0 (no pulse, always off) and full-scale deflection (no
pulse, period duration always on).
The PWM output can, for example, be used to control the speed of a motor from standstill to
full speed or you can use it to control the position of a valve from closed to completely open.
You configure the pulse width modulation (PWM) mode in STEP 7 (TIA Portal).
The pulse width modulation mode has the following functions:
● When the option "High-speed output (0.1 A)" is activated, you can generate a minimum
pulse duration of 2 μs at a current of 100 mA. If the option "High-speed output (0.1 A)" is
not activated, you can generate a minimum pulse duration of 20 μs with a load > 0.1 A
and a minimum pulse duration of 40 μs with a load of ≥ 2 mA and a current of maximum
0.5 A. If a standard output is used, you can generate a minimum pulse duration of 100 µs
with a load of > 0.1 and a minimum pulse duration of 200 µs with a load of ≥ 2 mA.
● You can control the pulse output (DQA) of the channel manually via the control and
feedback interface.
● You can configure the reaction to CPU STOP. Upon change to CPU STOP, the pulse
output (DQA) is set to the configured state.
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