7
3 RxD/TxD-P
5 DGND
6 VP
8 RxD/TxD-N
3
5
6
8
6
350 Ohm
3
220 Ohm
8
350 Ohm
5
LED
7.3 RS485 PROFIBUS COMMUNICATION PORT (optional)
The PROFIBUS interface allows a point to point connection: i.e. instrument to PC or other device. For the
connection use a STD cable for PROFIBUS connection with a 9-pole male connector on the device side. If
the standard cable for PROFIBUS is not available, produce one according to the scheme in the picture. Pay
attention that the connectors at the two edges of the cable must comply to the scheme in the picture.
The following list describes the signals used on the PROFIBUS interface.
Pin. Signal name Meaning
1 SHIELD
(1)
Not Connected
2 M24V
(1)
Not Connected
3 RxD/TxD-P Receive/Transmit-Data-P
4 CNTR-P
(1)
Control-P
5 DGND Data Ground
6 VP
(2)
Voltage Plus
7 P24V
(1)
Not Connected
8 RxD/TxD-N Receive/Transmit-Data-N
9 CNTR-N
(1)
Not Connected
(1)
Signal is optional
(2)
Signal is only necessary at station at end of bus cable.
The instrument back side is provided with the PROFIBUS network connector and
two rotary BCD switches, for network address programming.
For the configuration of a device in a PROFIBUS DP network, the following items
are required:
Master PROFIBUS DP (e.g. PLC Siemens Simatic S7 300, 400 or PROFIBUS •
interface for PC based control, to be plugged into the PC automation
system).
PROFIBUS network configuration program (it is usually supplied with the Master •
PROFIBUS DP)
Device•
“ALGO0509.GSD” file supplied with the instrument•
Before using a DP system, all stations should be given one single address.
The range of addresses that can be given to a PROFIBUS DP node goes from 1 to
99. The instrument back side is equipped with two selectors which can be used
to set the node address.
Example: node 15; with a screwdriver, select 1 on selector 1 and 5 on selector 2.
ATTENTION!
When the module, equipped with VPC3+, is operating, it has to be taken into consideration that
a not conform to the standards behaviour might occur, if in a multi-master-system:
at the same time DP masters class I and II accesses the slave with parametring/configuration •
data (very low probability)
other PROFIBUS Layer 2 based masters are involved•
Cable picture to be produced
Cable termination
Male 9 pin connector
Selector 1
(tens)
Selector 2
(unit)
RS485
connector
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