6 Commissioning Promag 53 PROFIBUS-DP/-PA
98 Endress+Hauser
Caution:
• It is essential that the following sequence be adhered to when configuring the meas-
ured variables – volume flow, totalizers 1...3, mass flow, display value and control!
• The device will have to be reset after the new measured variables have been config-
ured. This can be effected in either of two ways:
– Via the local display: HOME
→ Block J (SUPERVISION) → Group JAA (SYSTEM)
→ Function group 804 (OPERATION) → Function 8046 (SYSTEM RESET)
– Switch supply voltage off and then on again.
System units
The measured values are transmitted in system units - as described in the table on
Page 95 - to the automation control system during the cyclic data exchange.
If the system unit of a measured value is changed using the local display, this will not
have an immediate effect on the output of the AI block (Analog Input Block) and there-
fore will not influence the measured value which is transmitted to the automation control
system.
The altered system unit of the measured value will only be transmitted to the automation
control system once the “SET UNIT TO BUS” function in block G (BASIC FUNCTIONS)
→ Group GBA (PROFIBUS-DP/-PA) → function group 614 (OPERATION)
→ Function 6141 (SET UNIT TO BUS) has been activated. This can also be activated
with a Class 2 master (e.g. Commuwin II).
Configuration examples
The configuration of a PROFIBUS-DP system is normally effected in the following
manner:
1. The field device (Promag 53) which is to be configured is integrated into the con-
figuration program of the automation control system via the PROFIBUS-DP network.
The GSD file is used here. The configuration software can be used to configure
measured variables “offline”.
2. The automation control system's user program will have to be programmed now.
The input and output data is controlled in the user program and the location of the
measured variables is defined so that they can be processed further.
An additional measured value configuration module may have to be used in the
case of automation control systems which do not support the IEEE-754 floating
point format.
It may also be necessary to change the byte sequence (byte swapping) depending
on the type of data management employed in the automation control system (little-
endian format or big-endian format).
3. When configuration has been completed, this will be transferred to the automation
control system in the form of a binary file.
4. The system can be started now. The automation control system will establish a con-
nection to the configured devices. The device parameters which are relevant for the
process can now be set using the Class 2 master, e.g. with Commuwin II
(see Page 87).
To Next Page
Loading...
