102BTechnology instructions
9.3 Basic motion control
S7-1200 Programmable controller
360
System Manual, 11/2011, A5E02486680-05
Override response
The MC_MoveVelocity 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_MoveVelocity task aborts the
following active motion control tasks:
MC_Home Mode = 3
MC_Halt
MC_MoveAbsolute
MC_MoveRelative
MC_MoveVelocity
MC_MoveJog
Note
Behavior with zero set velocity (Velocity = 0.0)
An MC_MoveVelocity task with "Velocity" = 0.0 (such as an MC_Halt task) aborts active
motion tasks and stops the axis with the configured deceleration. When the axis comes to a
standstill, output parameter "InVelocity" indicates TRUE for at least one program cycle.
"Busy" indicates the value TRUE during the deceleration operation and changes to FALSE
together with "InVelocity". If parameter "Execute" = TRUE is set, "InVelocity" and "Busy" are
latched.
When the MC_MoveVelocity task is started, status bit "SpeedCommand" is set in the
technology object. Status bit "ConstantVelocity" is set upon axis standstill. Both bits are
adapted to the new situation when a new motion task is started.
9.3.2.8
MC_MoveJog instruction
Table 9- 39 MC_MoveJog instruction
LAD / FBD
SCL
Description
"MC_MoveJog_DB"(
Axis:=_multi_fb_in_,
JogForward:=_bool_in_,
JogBackward:=_bool_in_,
Velocity:=_real_in_,
InVelocity=>_bool_out_,
Busy=>_bool_out_,
CommandAborted=>_bool_out_,
Error=>_bool_out_,
ErrorID=>_word_out_,
ErrorInfo=>_word_out_);
Use the MC_MoveJog instruction to move
the axis constantly at the specified
velocity in jog mode. This instruction is
typically used for testing and
commissioning purposes.
In order to use the MC_MoveJog
instruction, the axis must first be enabled.
1
STEP 7 automatically creates the DB when you insert the instruction.
2
In the SCL example, "MC_MoveJog_DB" is the name of the instance DB.
