Jerk Limit - Siemens S7-1200 System Manual

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If the homing search does not function as you expected, check the inputs assigned to the

hardware limits or to the reference point. These inputs may have had their edge interrupts

disabled in device configuration.

Examine the configuration data for the axis technology object of concern to see which inputs

(if any) are assigned for "HW Low Limit Switch Input", "HW High Limit Switch Input", and

"Input reference point switch". Then open the Device configuration for the CPU and examine

each of the assigned inputs. Verify the "Enable rising edge detection" and "Enable falling

edge detection" are both selected. If these properties are not selected, delete the specified

inputs in the axis configuration and select them again.

Jerk limit

With the jerk limit you can reduce the stresses on your mechanics during an acceleration

and deceleration ramp. The value for the acceleration and deceleration is not changed

abruptly when the step limiter is active; it is adapted in a transition phase. The figure below

shows the velocity and acceleration curve without and with jerk limit.

Travel without step limiter

The jerk limit gives a "smoothed" velocity profile of the axis motion. This ensures soft starting

and braking of a conveyor belt for example.

S7-1200 Programmable controller

System Manual, 03/2014, A5E02486680-AG

Travel with step limiter

Technology instructions

9.3 Motion control