Operation Of The Pulse Outputs - Siemens SIMATIC S7-1200 System Manual

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Table of Contents

Extended instructions

Table 9- 190 STATUS parameter error code value

Error code (W#16#...)

Operation of the pulse outputs

Since the PWM output can be varied from 0 to full scale, it provides a digital output that in

many ways is the same as an analog output. For example, the PWM output can be used to

control the speed of a motor from stop to full speed, or it can be used to control position of a

valve from closed to fully opened.

You configure frequency in the hardware configuration. You control pulse width from the user

Four pulse generators are available for controlling high-speed pulse output functions: PWM

and Pulse train output (PTO). PTO is used by the motion control instructions. You can assign

each pulse generator to either PWM or PTO, but not both at the same time.

You can use onboard CPU outputs, or you can use the optional signal board outputs. The

output point numbers are shown in the following table (assuming the default output

configuration). If you have changed the output point numbering, then the output point

numbers will be those you assigned. Note that PWM requires only one output, while PTO

can optionally use two outputs per channel. If an output is not required for a pulse function, it

is available for other uses. Refer to the table below for I/O assignment.

Pulse generator with the specified hardware ID is in use.

Frequency out-of-range. The desired frequency exceeds the maximum frequency of the

pulse output selected.

PTO identifier (hardware ID) does not address a valid PTO.

Pulse generator with the specified hardware ID is not activated. Activate the pulse gen-

erator in the CPU properties under "Pulse generators (PTO/PWM)".

Pulse generator with the specified hardware ID has no PTO selection. Select PTO in

Hardware Configuration.

Pulse width can be expressed as hundredths of the

cycle time (0 to 100), as thousandths (0 to 1000), as

ten thousandths (0 to 10000), or as S7 analog format.

The pulse width can vary from 0 (no pulse, always off)

to full scale (no pulse, always on).

System Manual, V4.2, 09/2016, A5E02486680-AK

S7-1200 Programmable controller