PROFIBUS (Process Field Bus) is a standard for fieldbus communication in automation technology and was first promoted in 1989 by BMBF (German department of education and research) and then used by Siemens. It should not be confused with the PROFINET standard for Industrial Ethernet. PROFIBUS is openly published as part of IEC 61158.
Profibus comes in four variants, each with a different purpose:
- PROFIBUS DP (Decentralized Peripherals) used to drive sensors and actuators via a central controller. Dataspeed up to 12 Mbit/s with twisted pair cables and fiber optic cables are an option.
- PROFIBUS PA (Process Automation) is used to monitor measuring equipment via a process control system. This Profibus variant is ideal for use in explosive areas (Ex-zone 0 and 1). In the cables flows namely a weak current through the bus lines in an intrinsically safe circuit so that sparks do not occur, even at fault. The con. about this variant is the slow dataspeed at 31,25 kbit/s.
- PROFIsafe used for safety applications, usually with safety PLC’s or safety relays.
- PROFIdrive used in motion control.
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| Profibus Cable |
Profibus Connector:
| Pin # | Function | Description |
| 1 | Shield | Shield and functional earth |
| 2 | NC | Not in use |
| 3 | RxD/TxD-P | Data recieve and transmit (positive) |
| 4 | CNTR-P | Control signal to repeater (positive) |
| 5 | DGND | Reference potential for +5 volt and data |
| 6 | VP | +5 volt for terminating resistors (active termination) |
| 7 | NC | Not in use |
| 8 | RxD/TxD-N | Data recieve and transmit (negative) |
| 9 | CNTR-N | Control signal to repeater (negative) |
Profibus Wire Cutter:
The first thing to do is to remove the isolation of your Profibus cable. You can use a special Profibus Tripping Tool or if you are used to work with cables, you can use a knife or a wire cutter. The Profibus stripping tool is worth the money, because it will give you a sharp and perfect stripping of the Profibus cable needed for the connectors. It can be difficult to strip the cables correctly with a knife, so that both the shield and the two wires inside are visible.
How to Connect the master & slave ?
One master and slave connector as below diagram, The master connection in use a incoming entry only with switch on condition & slave connection for fist slave also incoming connection with the switch off condition. If other slave are connector then slave outgoing cable connected the next connector with on the terminal switch & other slave off.
Connecting the Profibus cable to the connector should be done with extra caution. Remember, that it is very important not only to connect the wires correct, but also to connect the shield correct and even to strip the wire correct. Take a look at this great instruction video if you’re in doubt about the connector:
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