Siemens S7-1200 System Manual page 366

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Table of Contents

Extended instructions

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.

The table below shows the default I/O assignments; however, the four pulse generators can

be configured to any CPU built-in or SB digital output. Different output points support

different voltages and speeds, so take that into account when assigning PWM/PTO

Pulse-train outputs cannot be used by other instructions in the user program.

When you configure the outputs of the CPU or signal board as pulse generators (for use with

the PWM or motion control PTO instructions), the corresponding outputs addresses are

removed from the Q memory and cannot be used for other purposes in your user program. If

your user program writes a value to an output used as a pulse generator, the CPU does not

write that value to the physical output.

PTO direction outputs can be freed for use elsewhere in your program.

Each PTO requires the assignment of two outputs: one as a pulse output and one as a

direction output. You can use just the pulse output and not the direction output. You can then

free the direction output for other purposes in your user program.

Table 8- 149 Default output assignments for the pulse generators

Built-in I/O

Built-in outputs

Built-in I/O

Built-in outputs

Built-in I/O

S7-1200 Programmable controller

System Manual, 03/2014, A5E02486680-AG