Siemens SIMATIC S7 System Manual page 369

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When the hardware limit switches are approached, the axis brakes to a standstill at the

configured emergency deceleration. The specified emergency deceleration must be

sufficient to reliably stop the axis before the mechanical stop. The following diagram

presents the behavior of the axis after it approaches the hardware limit switches.

Software limit switches

Software limit switches limit the "working range" of the axis. They should 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.

S7-1200 Programmable controller

System Manual, 11/2011, A5E02486680-05

The axis brakes to a standstill at the configured emergency decleration.

Range in which the hardware limit switches signal the stats "approached".

Allowed travel range

Mechanical stop

Lower hardware limit switch

Upper hardware limit switch

102BTechnology instructions

9.3 Basic motion control

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Simatic s7-1200