Profibus.

Rania El beshbishy

Hi

I am new PLC instructor, so I face some problems.

my lab 313c-2dp
my problems are in undersatnt the communications between plc and pc, Profibus DP and Profibus PA when I use this or that?

If i can make network in my lab?

Thanks

Eng. Rania El Beshbishy
Head of the practical sector
Electrical center
PVTD

There are two variations of PROFIBUS; the most commonly used DP, and the lesser used PA variations:

PROFIBUS (Process Field Bus) is a standard for field bus communication in automation technology and was first promoted (1989) by BMBF (German department of education and research). It should not be confused with the PROFINET standard for Industrial Ethernet.

• PROFIBUS DP (Decentralized Peripherals) is used to operate sensors and actuators via a centralized controller in production technology. The many standard diagnostic options, in particular, are focused on here. Other areas of use include the connection of "distributed intelligence", i.e. the networking of multiple controllers to one another (similar to PROFIBUS FMS). Data rates up to 12 Mbit/s on twisted pair cables and/or fiber optics are possible.
• PROFIBUS PA (Process Automation) is used to monitor measuring equipment via a process control system in process engineering. This PROFIBUS variant is ideal for explosion-hazardous areas (Ex-zone 0 and 1). Here, a weak current flows through bus lines in an intrinsically safe circuit so that explosive sparks are not created, even if a malfunction occurs. The disadvantage of this variant is the slower data transmission rate of 31.25 kbit/s.

PROFIBUS is the only field bus that can be used in equal measure in production automation and process automation and has since become a global market leader. Worldwide, over 20 million PROFIBUS devices are in use (as of 2007).
Reference: Wikipedia http://en.wikipedia.org/wiki/Profibus
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Back to your question:
Profibus DP is normally used if you have a master station like your CPU (313C-2DP). And some other slave I/O or devices. For example: Remote I/O station like ET200 or third parties remote I/Os, profibus DP drives, ...etc.
And If you want to link them to a PC using for HMI, you have to use PC adapter or Communication processor. Here's bellow their MLFB and short description:
PC adapter:
6ES7972-0CB20-0XA0
SIMATIC S7, PC ADAPTER USB F. CONNECTION OF S7-200/300/400 C7; WITH USB-CABLE (5M) CAN BE USED UNDER WIN 2000/XP

CP 5611 A2
6GK1561-1AA01
COMMUNICATION PROCESSOR CP 5611 A2 PCI-CARD (32 BIT; 3.3/5V;33/ 66 MHZ) FOR CONN. TO PG OR PC WITH PCI-BUS TO PROFIBUS OR MPI (NO WIN9X-SUPPORT!)

For Profibus PA instruments, there are link module (DP/PA link) should be located to link between DP and PA networks. And by usind this link module, you will have a PA bus and then you can connect on the PA bus your PA instrument.
DP/PA-LINK
6ES7153-2BA82-0XB0
SIMATIC DP, INTERFACE DP/PA-LINK A. ET200M IM153-2 HF FOR EXPANDED TEMPERATURE RANGE FOR MAX. 12 S7-300 MODULES, WITH REDUNDANCY, TIME STAMPING FIT FOR ISOCHRONE MODE NEW FEATURES: 12 MODULES / STATION SLAVE INITIATIVE FOR SWITCHES AND DRIVEES EXTENDED DATA FOR HART SECON- DARY VARIABLES OPERATON WITH 64PT MODULES EXTENDES TIMESTAMPS WITH 32 SIGNALS / SLOT

Hope this helps you
Regards,