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3 Principle of Operation

3.2 Interaction of motion control instructions and technology objects

Only an appropriate chronological order of the calls of the motion control

instructions in the control program of the SIAMTIC S7-1500 allows you to use the

TO in a technologically useful way.

Therefore, it is recommended to use a sequencer in the user program from which

the motion control instructions according to the PLCopen standard are called.

3.2.2

Technology data blocks

After generating the technology objects, technology data blocks are automatically

created. The TO status and more TO-typical information is entered in these blocks;

for an axis, this is, for example, the current position

The technology data block can be accessed like a normal data block.

3.2.3

Figure 3-2

Basically, all motion control instructions work on the following principle:

•

The Axis input specifies to which TO and therefore to which axis the motion

control instruction is to be sent.

•

A rising edge at the Execute input triggers the job. The job type depends on

the motion control instructions used.

•

The status outputs of the FB (Busy, Done, CommandAborted and Error)

display the job status.

–

While a job is active, the Busy output parameter displays the value TRUE;

when the job is complete, Busy displays the value FALSE.

–

The other output parameters display the status for at least one cycle. While

the Execute input parameter is set to TRUE, these status messages are

displayed on a latching basis.



Positioning axes only

SINAMICS G120 as a Speed Axis on the S7-1500

V1.0a, Entry ID: 78788716

While the Execute input is set to TRUE, the job status is displayed at

the status outputs of the FB (Busy, Done, CommandAborted and

Error).

If the Execute input parameter is set to FALSE while the job is not yet

complete (Busy = TRUE), the Done output (or Error or

CommandAborted) will be set to TRUE for only one cycle once the job

is complete!

and velocity.