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VersaPoint™ I/O System Profibus-DP NIU User’s Manual – August 2005
GFK-1911B
4
Bus Termination
Termination resistors are needed, as defined in DIN
1
9245 Part
1
section 3.
1
.2.5.
Master
Slave
Slave
Slave
Slave
Slave
Termination Required
(Segment
1
)
One terminator must be applied at each end of a network segment.
Master
Slave
S lave
Slave
S lave
Slave
Repeater
Term ination Required
(Segm ent
1
)
Term ination Required
(Segm ent 2)
Generally, termination is provided in commercially-available Profibus standard
network connectors. Some connector vendors provide termination capability in
the connector and a switch on the connector to enable/disable termination. Some
connector vendors provide both terminated and unterminated connectors.
Important
: For proper network termination, it is essential that the terminating
devices maintain power. Power is provided by the device on Pin 6 and Ground on
Pin 5. If power is lost to either terminating device, the network may not operate
correctly. Generally, the lone network master device is one of the terminating
devices. Therefore, a loss of power to the network master renders the network
inoperable anyway. The other terminating device may be a critical slave device
which must maintain power or a separately powered, stand-alone terminator.
These stand-alone devices are commercially available.
VP (6)
RxD/TxD-P (3)
RxD/TxD-N (8)
DGND (5)
Ru = 390 Ohms
Rt = 220 Ohms
Rd = 390 Ohms
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