User manual
51
User Manual
Interface cards IF-XX
EN
Date: 04-09-2012
About the interface cards
10. Probus card IF-PB1
Profibus stands for „Process Field Bus“ and is a primarily
european standard for field bus communication in automation
engineering.
The Profibus card allows to run up to 32 units on a bus seg-
ment without extra measures. Bus termination is typically
done on the Profibus plugs, which normally have integrated
switches and bus termination resistors.
Units with plugged IF-PB1 automatically recognize and
configure the card. In the device setup (see user instruction
guide of the device) the user merely has to select an unique
Profibus address for every unit that is going to be integrated
into the bus. This address is required for the Profibus slave
controller. As soon as it is connected to the bus, it will report
itself to the master. On the control side, which will normally be
a PC, it requires only a so-called GSD file (Generic Station
Description), which is loaded into the Profibus master control
software. This file defines the available functions of a device.
10.1 Transmission speed
The max. transmission speed of the Profibus slave controller
(12Mbit) is not the speed in which the communication with
the device is actually running. This speed is internally fixed
to 57600 Baud festgelegt and will result in certain execution
and response times. Also see section „8.4 Transmission and
execution times“.
10.2 Configuring the Profibus card
The interface card is configured in device setup menu.
It is required to select an unoccupied Profibus address for
every unit that is going to be connected to the bus.
M
+Communication + and
Slot: IF-PB1 +
you can select the card to cofigure and change following
parameter(s):
Profibus Default: 1
= {1..125}
One out of 125 Profibus addresses can be selected.
10.3 Connecting the bus
The unit is connected to the bus master or to other units with
a typical Profibus cable. Those cables are required to have a
built-in bus termination, either switchable or non-switchable.
Bus termination is required for units at the end of the bus.
10.4 Bus termination
Bus termination for Profibus is done with the integrated,
switchable bus termination resistors in the Profibus cable
plugs. Units at the end of the bus are required to be termi-
nated.
It is furthermore important to obey the provisions about the
maximum number of units on a bus segment (for IF-PB1,
these are 32), so that the minimum total resistance that is
defined by the bus specification is not exceeded. Any Pro-
fibus unit has a certain internal resistance that is parallel to
any other unit and bus termination plug.
10.5 Implementation on the control side
The control side, which normally will be a PC, requires to
implement our devices by means of a GSD resp. GSE file,
which is either supplied on the included CD or available
for download on our website. This text file describes the
functions that are available for our devices on a Profibus
connection.
These are:
• Querying actual values (U, I, P) DPV0
• Querying the device condition (CC, CV etc.) DPV0
• Parameter channel DPV1
The parameter channel DPV1 allows access to:
• Querying the set values of U, I, P
• Setting the set values for U, I, P
• Setting device condition (remote control, output)
10.6 Other features
Reset button
The little pushbutton that is located on the interface card
can be used to reset and restart a hanging, non-responding
connection. A short push while the unit is running and the
Profibus slave controller is restarted and will report itself to
the bus master and normal Profibus connection should be
available again.
The red LED
This LED indicates a correct Profibus connection.
LED off = Profibus connection OK
LED on = no Profibus connection or connection error