Siemens connection help - PLCS.net

the_msp · January 3rd, 2018, 11:15 AM

Hello, I am trying to connect to the following PLC s7-300. The PLC is in a box that takes 1/2 hour to remove from the line and ideally I need to connect when it is in situ, connected to its sensors.

There is a ProfiBus looking cable connected to the port labelled MPI, this goes to an HMI and a service port which has 3 leads soldered.

Using the attached MPI lead will I be able to connect via the service port?

Can I upload the program albeit with no comments?

TIA

cardosocea · January 3rd, 2018, 12:25 PM

Yes, you should be able to.

You'll have to configure the USB adapter (that's what that device will be called when you install it) and connect to either the MPI port or the Other port which seems to be a Profibus connection.

the_msp · January 3rd, 2018, 12:43 PM

OK, thanks, and I can connect the end of the USB adapter lead into the service port ok? I can't directly plug it into X1 on the CPU, no access when machine is connected...

geniusintraining · January 3rd, 2018, 12:48 PM

Find the other end of the cables... you may have one that will have a open port and you can just plug into it there, then you do not have to remove any you can just jump onto the network

You can also watch this video, its for our aftermarket but should be close enough for you to be able to do the same

https://www.youtube.com/watch?v=skAH715dPxM

The other end of the cable may look like this and you can just plug into it

the_msp · January 3rd, 2018, 12:51 PM

I know the other (MPI) end. Service port -> X1 -> HMI

The DP goes to the main (S7-400) CPU, I don't think I have an adapter to get onto it.

Thanks for video link

the_msp · January 3rd, 2018, 12:52 PM

P.s. the service port is DB9, nothing connected

geniusintraining · January 3rd, 2018, 02:47 PM

Quote:

Originally Posted by the_msp

I know the other (MPI) end. Service port -> X1 -> HMI

The DP goes to the main (S7-400) CPU, I don't think I have an adapter to get onto it.

Check to see if the 400 has a connection of the one similar to the pic I posted, most of the time you can just plug in and you dont need to unplug anything... also the HMI may have a double ended plug

January 3rd, 2018, 12:43 PM	#3
the_msp Lifetime Supporting Member Join Date: May 2008 Location: Northern Ireland Posts: 598	OK, thanks, and I can connect the end of the USB adapter lead into the service port ok? I can't directly plug it into X1 on the CPU, no access when machine is connected... __________________ Regards, Patrick https://www.youtube.com/user/MrMatrixEngineering

January 3rd, 2018, 12:51 PM	#5
the_msp Lifetime Supporting Member Join Date: May 2008 Location: Northern Ireland Posts: 598	I know the other (MPI) end. Service port -> X1 -> HMI The DP goes to the main (S7-400) CPU, I don't think I have an adapter to get onto it. Thanks for video link __________________ Regards, Patrick https://www.youtube.com/user/MrMatrixEngineering

January 3rd, 2018, 12:52 PM	#6
the_msp Lifetime Supporting Member Join Date: May 2008 Location: Northern Ireland Posts: 598	P.s. the service port is DB9, nothing connected __________________ Regards, Patrick https://www.youtube.com/user/MrMatrixEngineering

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January 3rd, 2018, 12:25 PM	#2
cardosocea Member Join Date: Nov 2016 Location: Fields of corn Posts: 675	Yes, you should be able to. You'll have to configure the USB adapter (that's what that device will be called when you install it) and connect to either the MPI port or the Other port which seems to be a Profibus connection.

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