GFK-1911B
Chapter 2 The Profibus NIU
2-7
2
Connectors on the NIU
Profibus Connector
A 9-position, D-SUB connector connects the NIU to the Profibus cable.
Pin
Assignment
1
Reserved
2 Reserved
3
RxD/TxD-P (+ receive/send data), cable B
4
CNTR-P (control signal for repeater), direction control
5
DGND (reference potential up to 5 V)
6
VP (supply v5 V for terminal resistors)
7 Reserved
8
RxD/TxD-N (– receive/send data), cable A
9 Reserved
Line Terminal Resistors
Since Profibus is a serial bus system in a star-tree structure, the individual
branches must be terminated with a terminal resistor. The NIU does not have an
integrated resistor of this type. Many Profibus connectors are available with an
integrated, switchable resistor. Please contact your GE
Intelligent Platforms
distributor to determine availability.
Содержание VersaPoint IC220PBI002
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