Siemens S7-1200 - Mc_Moveabsolute (Position Axis Absolutely) Instruction

Technology instructions
9.3 Motion control
S7-1200 Programmable controller
464 System Manual, 03/2014, A5E02486680-AG
Override response
The MC_Halt task can be aborted by the
following motion control tasks:
•
MC_Home Mode = 3
•
MC_Halt
•
MC_MoveAbsolute
•
MC_MoveRelative
•
MC_MoveVelocity
•
MC_MoveJog
The new MC_Halt task aborts the following
active motion control tasks:
•
MC_Home Mode = 3
•
MC_Halt
•
MC_MoveAbsolute
•
MC_MoveRelative
•
MC_MoveVelocity
•
MC_MoveJog
9.3.5.6
MC_MoveAbsolute (Position axis absolutely) instruction
Table 9- 37 MC_MoveAbsolute instruction
LAD / FBD
SCL
Description
"MC_MoveAbsolute_DB"(
Axis:=_multi_fb_in_,
Execute:=_bool_in_,
Position:=_real_in_,
Velocity:=_real_in_,
Done=>_bool_out_,
Busy=>_bool_out_,
CommandAborted=>_bool_out_,
Error=>_bool_out_,
ErrorID=>_word_out_,
ErrorInfo=>_word_out_);
Use the MC_MoveAbsolute
instruction to start a positioning
motion of the axis to an absolute
position.
In order to use the
MC_MoveAbsolute instruction, the
axis must first be enabled and also
must be homed.
1
STEP 7 automatically creates the DB when you insert the instruction.
2
In the SCL example, "MC_MoveAbsolute_DB" is the name of the instance DB.
Table 9- 38 Parameters for the MC_MoveAbsolute instruction
Parameter and type
Data type
Description
Axis
IN
TO_Axis_1
Axis technology object
Execute IN Bool Start of the task with a positive edge (Default value: False)
Position IN Real Absolute target position (Default value: 0.0)
Limit values: -1.0e
12
≤ Position ≤ 1.0e
12
Velocity IN Real Velocity of axis (Default value: 10.0)
This velocity is not always reached because of the configured
acceleration and deceleration and the target position to be
approached.
Limit values: Start/stop velocity ≤ Velocity ≤ maximum velocity
Done
OUT
Bool
TRUE = Absolute target position reached
Busy
OUT
Bool
TRUE = The task is being executed.