Hitachi SJ-PB(T) Physical interface, Profibus connectors, Pin Layout of SJ-PB Name Function

CHAPTER 3 WIRING, CONNECTING

3.1 Physical interface

Isolation: The bus is galvanically separated from the other electronics with an on board DC/DC converter. Bus signals (A-line and B-line) are isolated via photo couplers.

Profibus-DP communication ASIC: VPC3 chip from ProfiChip.

Bus connection: The SJ-PB connects to the Profibus network with a 9-pin female DSUB connector. For the pin layout, refer to Table 3-1.

Table 3-1 Pin Layout of SJ-PB

Pin	Name	Function
Housing	Shield	Connected to PE
1	Not Connected	-
2	Not Connected	-
3	B-Line	Positive RxD/TxD according to RS 485 specification
4	RTS	Request To Send (note)
5	GND BUS	Isolated GND from RS 485 side (note)
6	+5V BUS	Isolated +5V from RS 485 side (note)
7	Not Connected	-
8	A-Line	Negative RxD/TxD according to RS 485 specification
9	Not Connected	-

(note) +5V BUS and GND BUS are used for bus termination. Some devices, like optical transceivers (RS485 to fibre optics) might require external power supply from these pins. RTS is used in some equipment to determine the direction of transmission. In standard applications only A-Line, B-Line and Shield are used.

The SJ-PBT connects to the Profibus network with a 6-poles 2pieces connector. For the pin layout, refer to Table 3-2.

		Table 3-2 Pin Layout of SJ-PBT
Pin	Name		Function
1	B-Line(in)		Positive RxD/TxD according to RS 485 specification
2	A-Line(in)		Negative RxD/TxD according to RS 485 specification
3	Shield		Connected to PE
4	B-Line(out)		Positive RxD/TxD according to RS 485 specification
5	A-Line(out)		Negative RxD/TxD according to RS 485 specification
6	Shield		Connected to PE

3.2 Profibus connectors

On the SJ-PB, any standard Profibus connector can be used. Depending on baudrate, IP-classing and physical size of connector there are several different manufacturers and models, the prizing may also vary. For more information it is recommended to contact the manufacturer, e.g., Siemens or Erni.

SJ-PBT: In this case, the network connector is attached with SJ-PBT option board.

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