Mc_Home (Home Axis) Instruction - Siemens S7-1200 System Manual

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Technology instructions

9.3 Motion control

MC_Home (Home axis) instruction

MC_Home instruction

STEP 7 automatically creates the DB when you insert the instruction.

In the SCL example, "MC_Home_DB" is the name of the instance DB.

The following types of homing are available:

● Direct homing absolute (Mode = 0): The current axis position is set to the value of

parameter "Position".

● Direct homing relative (Mode = 1): The current axis position is offset by the value of

parameter "Position".

● Passive homing (Mode = 2): During passive homing, the MC_Home instruction does not

carry out any homing motion. The traversing motion required for this step must be

implemented by the user via other motion control instructions. When the reference point

switch is detected, the axis is homed.

● Active homing (Mode = 3): The homing procedure is executed automatically.

"MC_Home_DB"(

Axis:=_multi_fb_in_,

Execute:=_bool_in_,

Position:=_real_in_,

Mode:=_int_in_,

Done=>_bool_out_,

Busy=>_bool_out_,

CommandAborted=>_bool_out_,

Error=>_bool_out_,

ErrorID=>_word_out_,

ErrorInfo=>_word_out_);

Use the MC_Home instruction to match

the axis coordinates to the real, physical

drive position. Homing is required for

absolute positioning of the axis:

In order to use the MC_Home instruction,

the axis must first be enabled.

S7-1200 Programmable controller

System Manual, 03/2014, A5E02486680-AG