siemens S7-200 - PC interface

benji · Oct 20, 2008

im looking for to build my own scada software to monitor variables and send commands back to the S7-200
im going to do the software in C++
the problem is that i dont know about the protocol the s7200 uses

does the programming cable do it without any additional hardware?
anyone done this before? any info ?

userxyz · Oct 20, 2008

click

click here: http://www.plctalk.net/qanda/showthread.php?t=25160

It looks like your PPI cable will do the job...

OPC is the way to go for you.

Greetz

benji said:
im looking for to build my own scada software to monitor variables and send commands back to the S7-200
im going to do the software in C++
the problem is that i dont know about the protocol the s7200 uses

does the programming cable do it without any additional hardware?
anyone done this before? any info ?

jvdcande · Oct 20, 2008

the problem is that i dont know about the protocol the s7200 uses

You're not alone. The protocol is called PPI (Point-To-Point interface), but that's about all I know about it.

does the programming cable do it without any additional hardware?

NO. The programming port of the S7-200 PLC is RS485, most PCs have RS232 and/or USB ports. The original Siemens cable contains a data driven converter from RS232 or USB to RS485.

anyone done this before?

GeniusInTraining here has produced an interface, which you can buy there.

Kind regards,

userxyz · Oct 20, 2008

hey

didn't know if it works with the converter.

I think with a CP5512 it should work.

https://mall.automation.siemens.com/BE/guest/index.asp?aktprim=0&nodeID=10023520&lang=en&foldersopen=-1985-1978-1977-1391-1390-1-1995-&jumpto=1995

This is the driver you need to run for OPC.

For the connection I would buy an CP 243-1 IT

jvdcande said:
You're not alone. The protocol is called PPI (Point-To-Point interface), but that's about all I know about it.
NO. The programming port of the S7-200 PLC is RS485, most PCs have RS232 and/or USB ports. The original Siemens cable contains a data driven converter from RS232 or USB to RS485. GeniusInTraining here has produced an interface, which you can buy there.

Kind regards,

KONTROLNET · Oct 20, 2008

pc access works great....

name: S7-200 Pc Access V.1.0.2.26

jvdcande · Oct 20, 2008

Combo,

I have tested both the RS232-PPI cable from Siemens as well as the interface sold by GeniusInTraining with CitectSCADA and both worked very well.

I didn't test it with OPC software, but if it works with CitectSCADA there should be some useable OPC software around too.

Kind regards,

geniusintraining · Oct 20, 2008

jvdcande said:
I have tested both the RS232-PPI cable from Siemens as well as the interface sold by GeniusInTraining with CitectSCADA and both worked very well.,

Thanks Jean, I now have several types, I need to send you one of my new styles to see if you have the same results...

Or benji, I could send it to you and you could try it with your project... send me a PM or email

benji · Oct 20, 2008

thanks you guys for the info

about the programming cable, isnt it alredy made to convert rs-232 to rs-485 ?

actually im looking for to send/recieve data through my computer serial port (i want to build my own software)
i think i should send a specific byte to do somthing with the plc (read a designated variable or command an input)

so what i need here is the software protocol for the plc s7-200

arnt there any pdf text book that shows the protocol?

the hardware interface would be fairly easy than the programming interface part

jvdcande · Oct 21, 2008

arnt there any pdf text book that shows the protocol?

I'm afraid not, nor in any other format, at least none that I know about. Siemens is very protective when it comes to information about their communication protocols. They're protecting their market and that's very understandable.

Kind regards,

userxyz · Oct 21, 2008

+...

I know it's not an answer to your question because u use an S7-200 CPU, but...

I've red somewhere that the new ET200M on profinet can be an I/O device without a CPU, controlled with OPC from a PC with the ethernet connection. So the processing is done in VB, C or whatever...

benji said:
thanks you guys for the info

about the programming cable, isnt it alredy made to convert rs-232 to rs-485 ?

actually im looking for to send/recieve data through my computer serial port (i want to build my own software)
i think i should send a specific byte to do somthing with the plc (read a designated variable or command an input)

so what i need here is the software protocol for the plc s7-200

arnt there any pdf text book that shows the protocol?

the hardware interface would be fairly easy than the programming interface part

Mynul Boss · May 7, 2016

I have a s7 200 plc version 1.12. It is password protected. But i need to program a HMI for the machine. Is it possible to read the program/ data registor which are used in PLC. If Yes please tell me how? Someone tell me that they can find the password of S7 200 PLC Version: under 2.1
Is it True? and they tell me their system is debugging.

siemens S7-200 - PC interface

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