Siemens SIMATIC NET PROFIBUS manual Introduction, Obt

Introduction 1

The PROFIBUS OBT (Optical Bus Terminal) is a network component for use in optical PROFIBUS DP fieldbus networks. It allows the attachment of a single device without an integrated optical interface to the optical PROFIBUS DP. The following figure illustrates a typical configuration.

PC	ET 200M with	DP node without	SIMATIC S7-400
Programming Device
	FO interface	FO interface	with IM 467 FO
Operator Panel

À À

		1)			1)
OBT
				OBT
	À
				À	2)
2)			2)

ÀTerminating resistor activted

1)PROFIBUS cable (terminated at both ends)

2)Plastic FO cable or PCF FO cable with two fibers

Figure 1-1 Example of an Optical PROFIBUS DP Configuration

PROFIBUS Optical Bus Terminal (OBT)	1-1
C79000-G8976-C122-02