I need help writing a program to achieve the functionality of a flying shear role-forming machine operating in cutting-to-length mode. The system comprises the following components, as depicted in the attached picture:

Could someone provide a sample program that utilizes similar components as much as possible? Thank you in advance for your assistance.

Hello Dear,

Thank you for your assistance and swift response.

I confirm that, as per your explanation, the servo motor facilitates the horizontal movement of the cutter, synchronizing its speed with that of the three-phase induction motor, which is monitored by an external encoder.

The external encoder serves to measure the necessary length, triggering a signal to activate the pneumatic piston for vertical cutting. Additionally, it monitors the speed of the product (metal roll) controlled by the three-phase induction motor.

Therefore, in this application there will be no need to use a "leadingAxis" only "extEncoder" and "flyingSawAxis" in "BasicControlSaw" and "FlyingSawLength" function blocks.

I have confused a little bit with modifying the shared example to be suitable to my application that does not has "leadingAxis". So, my request is to share with me if available an example similar to my described application?

Best regards,

Hello,

The FlyingSaw Basic example can be used with leadingAxis or just with extEncoder or both . Nothing needs to be changed in the code.

If, as in your case, there is no leading axis, the leading axis input only needs to be set to the value "NULL" as described in OB1 in NW1:

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This example shows how the function block can be called if both TO's extEncoder and leadingAxis are avilable.

If just one of these TO's are avilable the function block can also be called without definition of the TO which is not available.

"NULL" defines the TO is not available.

e.g. only extEncoder TO is available:

"SimExternalEncoder" - extEncoder

NULL - leadingAxis

"FlyingSawAxis" - flyingSawAxis

Note: Changes of these three input parameters will be effective after the next cpu restart

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On the “FlyingSawLength” block, the “leadingAxis” input must also be set to the value “NULL” as described in OB1 in NW2

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Function "FlyingSawLength"

This example shows how the function block can be called if both TO's extEncoder and leadingAxis are available.

If just one of these TO's are avilable the function block can also be called without definition of the TO which is not available.

"NULL" defines the TO is not available.

e.g. only extEncoder TO is available:

"SimExternalEncoder" - extEncoder

NULL - leadingAxis

"FlyingSawAxis" - flyingSawAxis

Note: Changes of these three input parameters will be effective after the next cpu restart

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Additionally:

on the "FlyingSawLength" block, the input "masterSelectExtEnc" must be set to "true".

Practical tip:

Even if there is no leading axis on the machine, I always create a leading axis (and parameterize it for simulation). This means that the function can be tested without moving the ExtEncoder and what should be used can easily be switched via the “masterSelectExtEnc” input.

Piston Control:

If the cutter axis is synchronous, the "cutPossible" signal will be set to "true" and the pneumatic piston can be triggered.

When the cut has been made, the “cutDone” input must be triggered.

The axis moves back again.

Note:

The FlyingSawBasic example  also has an integrated simulation option and can also be tested completely simulated without drives using the integrated HMI panel.

All functions can be simulated without additional software.

Just download the example:

https://support.industry.siemens.com/cs/attachments/109962920/FlyingSawBasicV2_Step7V16_proj_lib.zip

and download it to PLCSim or the real CPU and start the HMI simulation.

This can be helpful to familiarize yourself with the function.