Siemens SIMATIC NET PROFIBUS manual Topology with Integrated Optical Interfaces, Transmission Rate

Topologies of SIMATIC NET PROFIBUS Networks

2.2.1Topology with Integrated Optical Interfaces

The optical PROFIBUS network with nodes having an integrated FO interface is structured as a bus topology. The PROFIBUS nodes are interconnected in pairs by duplex fiber-optic cables.

Up to 32 PROFIBUS nodes with integrated FO interfaces can be connected in series in an optical PROFIBUS network. If a PROFIBUS node fails, the bus topology means that all DP slaves on the side away from the DP master are no longer obtainable for the DP master.

	S7-400 with IM 467 FO		ET 200M with		S7-300
PG/PC/OP			IM 153-2 FO			OP 25
						À
	2	1			2	2
		Distances between 2	1
OBT	1	nodes:		OBT
		Plastic FO cable up to 50 m
		PCF FO cable up to 300 m
	Terminating resistor activated					other
À						nodes
1 FO cable
2 LAN cable for PROFIBUS

Figure 2-2 PROFIBUS DP Network with Nodes Having Integrated FO Interfaces

For short distances, the preassembled 830-1T or 830-2 connecting cables can be used as an alternative to the PROFIBUS cable.

Transmission Rate

An optical PROFIBUS network with a bus topology can be operated at the following transmission rates:

9.6Kbps, 19.2 Kbps, 45.45 Kbps, 93.75 Kbps, 187.5 Kbps, 500 Kbps, 1.5 Mbps and 12 Mbps

2-6	PROFIBUS Networks SIMATIC NET
	6GK1970-5CA20-0AA1 Release 2 05/2000