Siemens SIMATIC S7-1200 System Manual page 715

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Table of Contents

Software limit switches

Software limit switches limit the "working range" of the axis. They must fall inside the

hardware limit switches relative to the travel range. Because the positions of the software

limit switches can be set flexibly, the working range of the axis can be restricted on an

individual basis depending on the current traversing profile. In contrast to hardware limit

switches, software limit switches are implemented exclusively by means of the software and

do not require their own switching elements.

If software limit switches are activated, an active motion is stopped at the position of the

software limit switch. The axis is braked at the configured deceleration. The following

diagram presents the behavior of the axis until it reaches the software limit switches.

Use additional hardware limit switches if a mechanical endstop is located after the software

limit switches and there is a risk of mechanical damage.

S7-1200 Programmable controller

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

The axis brakes to a standstill at the configured deceleration.

Working range

Lower software limit switch

Upper software limit switch

Technology instructions

10.3 Motion control