Profibus Terminating Resistor Siemens

Bus terminations are sometimes provided on repeaters when used as the start of a segment. We need to exchange this pyrometer by microepsilon model but this dont have a second m12 connector to put the resistor.

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At the end of the daisy chain bus of profibus a pyrometer from sensortherm is installed connector m12 for the net and m12 termination resistor separately but coupled on the sensor without t distributor.

Profibus terminating resistor siemens. My advice would be to connect the pyrometer somewhere in the middle of the bus. With profibus dpdp is the bus terminations are integrated in the connectors and can be activated and deactivated by a switch. Hi expertswhat is the proper profibus connector terminating resistor settings on bus ring topology.

A profibus termination is done by inserting a 220 w resistor in each end of the profibus line. The rule is that each profibus segment must be terminated at both end. And i would also like to know what happens if you use non profibus cable which impedance differs from the original profibus cable.

So you insert a 220 w resistor in the first and one in the last station. The terminating resistor of pb consist of 3 resistors 380 380 and 220ohm. The profibus connector that has only 1 cable connected it needs to be connected to a1 b1 terminals and the terminating resistor must be switched in on positon which disconnect the internal loop to a2 b2.

The reason for using a 220 w resistor is that the two 220 w resistors are connected parallel to each other. Siemens devices deliver that 5v dc in their connector and when you close the termination switch on the profibus connector you connect to that supply but you dont see it explicitaly. With profibus dp and profibus dpis the bus terminations have a combination of resistors that are often integrated in the connectors.

The bus terminations are active and must be electrically powered. I would like to know where these values come from. Please see attached file for your referencewe have already tried the two available options turning on and off the terminating resistor of the profibus.

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