Siemens S7-1200 System Manual page 442

Hide thumbs Also See for S7-1200:

Table of Contents

Technology instructions

9.3 Motion control

A signal board (SB) expands the onboard I/O to include a few additional I/O points. An SB

with two digital outputs can be used as pulse and direction outputs to control one motor. An

SB with four digital outputs can be used as pulse and direction outputs to control two motors.

Built-in relay outputs cannot be used as pulse outputs to control motors. Whether you use

onboard I/O or SB I/O or a combination of both, you can have a maximum number of four

pulse generators.

The four pulse generators have default I/O assignments; however, they can be configured to

any digital output on the CPU or SB. Pulse generators on the CPU cannot be assigned to

SMs or to distributed I/O.

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 instructions), the corresponding output addresses no longer

control the outputs. 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.

Maximum number of controllable drives

Pulse and direction outputs

Power section for stepper motor

Power section for servo motor

The DC/DC/DC variants of the CPU S7-1200 have onboard

outputs for direct control of drives. The relay variants of the

CPU require the signal board with DC outputs for drive

Onboard I/O;

No SB installed

(2 x DC outputs)

S7-1200 Programmable controller

System Manual, 03/2014, A5E02486680-AG

(4 x DC outputs)