Chapter 3 Wiring, Connecting; Physical Interface; Profibus Connectors - Hitachi SJ-PB(T) Instruction Manual

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.
Pin Name
Housing Shield
1 Not Connected
2 Not Connected
3 B-Line
4 RTS
5 GND BUS
6 +5V BUS
7 Not Connected
8 A-Line
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.
Pin Name
1 B-Line(in)
2 A-Line(in)
3 Shield
4 B-Line(out)
5 A-Line(out)
6 Shield

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.
Table 3-1 Pin Layout of SJ-PB
Function
Connected to PE
-
-
Positive RxD/TxD according to RS 485 specification
Request To Send (note)
Isolated GND from RS 485 side (note)
Isolated +5V from RS 485 side (note)
-
Negative RxD/TxD according to RS 485 specification
-
Table 3-2 Pin Layout of SJ-PBT
Function
Positive RxD/TxD according to RS 485 specification
Negative RxD/TxD according to RS 485 specification
Connected to PE
Positive RxD/TxD according to RS 485 specification
Negative RxD/TxD according to RS 485 specification
Connected to PE
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