Monitoring The Mc_Movejog Instruction - Siemens S7-1200 System Manual

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Monitoring the MC_MoveJog instruction

The tasks of motion control instruction "MC_MoveJog" implement a jog operation.

● The motion control tasks "MC_MoveJog" do not have a defined end. The task objective is

● The order is complete when input parameter "JogForward" or "JogBackward" has been

● The output parameters "Busy", "CommandAborted", and "Error" signal that the task is still

The behavior of the status bits is presented below for various example situations.

● The first example shows the behavior or the axis if the parameterized velocity is reached

● The second example shows the behavior of the axis if the task is aborted. If the motion

● The third example shows the behavior of the axis if an error occurs. If an error occurs

S7-1200 Programmable controller

System Manual, 03/2014, A5E02486680-AG

fulfilled when the parameterized velocity is reached for the first time and the axis travels

at constant velocity. When the parameterized velocity is reached, this is indicated by the

value TRUE in output parameter "InVelocity".

set to the value FALSE and the axis has come to a standstill.

being processed, has been aborted or an error is pending.

– During processing of the motion control task, the output parameter "Busy" indicates

the value TRUE. If the task has been completed, aborted, or stopped by an error, the

output parameter "Busy" changes its value to FALSE.

– The output parameter "InVelocity" indicates the status TRUE, as long as the axis is

moving at the parameterized velocity. The output parameters "CommandAborted" and

"Error" indicate the status for at least one cycle. These status messages are latched

as long as either input parameter "JogForward" or "JogBackward" is set to TRUE.

and maintained. If the motion control task has been executed by the time the

parameterized velocity is reached, this is indicated by the value TRUE in output

parameter "InVelocity".

control task is aborted during execution, this is indicated by the value TRUE in output

parameter "CommandAborted". The behavior is independent of whether or not the

parameterized velocity has been reached.

during execution of the motion control task, this is indicated by the value TRUE in output

parameter "Error". The behavior is independent of whether or not the parameterized

velocity has been reached.

Technology instructions

9.3 Motion control