Proline Promass E 300 Modbus RS485
System integration
Hauser
73
Structure of the Modbus data map
The Modbus data map consists of two data sets:
• Scan list: Configuration area
The device parameters to be grouped are defined in a list in that their Modbus RS485
register addresses are entered in the list.
• Data area
The measuring device reads out the register addresses entered in the scan list cyclically
and writes the associated device data (values) to the data area.
For an overview of device parameters with their respective Modbus register
information, please refer to the "Modbus RS485 register information" section in the
"Description of device parameters" documentation → 198.
Scan list configuration
For configuration, the Modbus RS485 register addresses of the device parameters to be
grouped must be entered in the scan list. Please note the following basic requirements of
the scan list:
Max. entries
16 device parameters
Supported device parameters
Only parameters with the following characteristics are supported:
• Access type: read or write access
• Data type: float or integer
Configuring the scan list via FieldCare or DeviceCare
Carried out using the operating menu of the measuring device:
Expert → Communication → Modbus data map → Scan list register 0 to 15
Scan list
No.
Configuration register
0
Scan list register 0
...
...
15
Scan list register 15
Configuring the scan list via Modbus RS485
Carried out using register addresses 5001 - 5016
Scan list
No.
Modbus RS485 register
Data type
Configuration register
0
5001
Integer
Scan list register 0
...
...
Integer
...
15
5016
Integer
Scan list register 15
Reading out data via Modbus RS485
The Modbus master accesses the data area of the Modbus data map to read out the current
values of the device parameters defined in the scan list.
Master access to data area
Via register addresses 5051-5081
