Siemens SIMATIC S7 System Manual page 375

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Velocity characteristics of MC homing

Search phase (blue curve segment): When active homing starts, the axis accelerates to the configured "approach

velocity" and searches at this velocity for the reference point switch.

Reference point approach (red curve section): When the reference point switch is detected, the axis in this example

brakes and reverses, to be homed on the configured side of the reference point switch at the configured "reduced

Travel to reference point position (green curve segment): After homing at the reference point switch, the axis travels

to the "Reference point coordinates" at the "reduced velocity". On reaching the "Reference point coordinates", the

axis is stopped at the position value that was specified in the Position input parameter of the MC_Home instruction".

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.

S7-1200 Programmable controller

System Manual, 11/2011, A5E02486680-05

102BTechnology instructions

9.3 Basic motion control

Approach velocity

Reduced velocity

Home position coordinate

Home position offset

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Simatic s7-1200