Extended instructions
9.8 Pulse
S7-1200 Programmable controller
System Manual, V4.2, 09/2016, A5E02486680-AK
495
Table 9- 193 SB signal board output: Maximum frequency (PTO) and minimum cycle time (PWM)
SB 1223, 200 kHz DQe.0, DQe.1 200kHz 5 µs
Note
The minimum cycle time of each of the CPU and Signal Board outputs is given in the tables
above. However, TIA Portal does not alert you when you configure a PWM pulse generator
with
a cycle time that exceeds this hardware limitation. Problems can result with your
application, so always ensure that you do not exceed the minimum cycle time of the
hardware.
The Parameter assignment section allows the user to configure the parameters of the output
pulse. The following options are available, depending on whether PWM or PTO is selected:
● Signal type: Configure the pulse output as PWM or PTO. For PTO selections, refer to
"Phasing" (Page 658) for further information:
– PWM
– PTO (pulse A and direction B)
– PTO (pulse up A and pulse down B)
– PTO (A/B phase-shifted)
– PTO (A/B phase-shifted - fourfold)
● Time base (only applies to PWM): Select which units of time to use:
– Milliseconds
– Microseconds
● Pulse duration format (only applies to PWM): Assign the resolution of the pulse duration
(width):
– Hundredths (0 to 100)
– Thousandths (0 to 1000)
– Ten-thousandths (0 to 10000)
– S7 analog format (0 to 27648)
● Cycle time (only applies to PWM): Assign the time duration it takes to complete one pulse
(pulse high time plus pulse low time equals cycle time). You can change the cycle time at
runtime by selecting the check box "Allow runtime modification of the cycle time". Refer to
the "I/O addresses" section below for further information. Range is 1 to 16,777,215 units
of time.
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