control Fb run message

Hi,

We have a certain motor that functions, with a digital output to start the signal. We have a digital input as run signal.

We also have near the motor outside a manual switch to start the motor by hand when needed.

Only there is a problem when we turn on the real switch near the motor, the run signal will turn on while we do not want that because this will result in an error message.

I thought to connect an AND block with my DO signal ‘’start motor’’ and DI signal ‘’run’’  and connect this to PV_IN to have only a run signal when I really steer the DO signal.

Only then my FB gives a bad signal. Is there any explanation for this, is this not allowed, resulting in an error what I do? And what is a way to solve this?

AGrS

Hi,

We have a certain motor that functions, with a digital output to start the signal. We have a digital input as run signal.

We also have near the motor a manual switch to start the motor.

Only there is a problem when we turn on the real switch near the motor, the run signal will turn on while we do not want that because this will result in an error message.

I thought to connect an AND block with my DO signal ‘’start motor’’ and DI signal ‘’run’’  and connect this to PV_IN to have only a run signal when I really steer the DO signal.

Only then my FB gives a bad signal. Is there any explanation for this, is this not allowed, resulting in an error what I do? And what is a way to solve this?

 Hello AGrS,

In those situations, I suggest you use the Local Mode.

Local Mode is specially designed for local operation. Like Automatic and Manual mode, Local Mode is used so a operator can control the object from a certain location.

This will prevent dangerous situations like the operator controls the motor from the faceplate while standing next to the motor.

It is a standard APL functionality.

See the following attachment. I made a selection from the APL library on Local Mode

Hi,

under the following link you can find a library whit Motor control module types with local operatoing mode.

https://support.industry.siemens.com/cs/ww/en/view/109475748

Hope this helps.

I use the motor for an automatic process, I have set Local=1 and LocalOp=1, I will see what happens if it also functions automatic in order to use it in an SFC.

Please see the following diagram in attachment.

You will have to set the block to Local Mode, which is basically a mode like any other: Manual and Automatic.

You can exit the local mode by two ways with the use of the featurebit 10:

If FeatureBit 10 = 0, You can exit from Local to Manual mode

If FeatureBit 10 = 1, You change back to the mode which was last active.

There are multiple possibilities for using the local mode which is presented by the LocalSetting parameter:

Local Setting 1 and 3:

Control settings are made by CFC logic, runtime monitoring is active, Interlocking functions of the block are activated in accordance with input parameter ByProt = 0 or deactivated (ByProt=1).

Local Setting 2 and 4:

Control settings are made based on internal adjustment of the feedback signals and runtime monitoring is disabled.

I suggest you look at page 74 of the attachment. It lists all possibilities.

If you want the full manual, please see the following manual:

PCS7 Advanced Process Library (V8.1)

Hi,

thanks for the feedback I understand it more now, sorry i should have seen that CFC/SFC logic still are active while local setting is 1. I saw that FeatureBit 10 = 1 in my parameter list of MOT.

I want to set Loc setting on 1, however, I cannot find the local setting parameter in my mot block, so I cannot set it to 1, or is it located somewhere else, or is it not included in my version of pcs7? Also ByProt I cannot find.....

I have set it up like attached now. However in wincc I am not able to select local mode. Only manual and automatic, local mode remains grey.

Hi AGrs,

It looks like this is a custom block??

I don't think it's coming from another APL library by the looks of it.

Oreca, this is a block FB1305 of AdvLibPP called Motpp, sorry I dont know if you then call it a custom block.

edit:

Oreca, the only problem is with your solution, I forgot to tell this, when the manual switch is operated, I dont have a digital inputs signal that tells me that this is the case, that the motor is switched on manually. So I cannot link it to LocOp to put it in local mode.

I think then the only solution is to put fb run on simulation mode which will not results in feedback errors anymore.

Hi,

Well, I don't know this library. Could you tell me a bit more, do you have a manual of this library? It doesn't look like it's an APL block.

For PCS7, you only have the Condition Monitoring library and the Industry Library and add-ons CEMAT and Braumat.

What I mean with custom block is a non Siemens block. For example, a user which created a SCL source.

Hi Oreca,

see attachment, but by the way, the only problem is with your solution, I forgot to tell this, when the manual switch of the motor is operated outside, I dont have a digital input signal that tells me that this is the case, that is, that the motor is switched on manually. So I cannot link it to LocOp to put it in local mode automatically.