Endress+Hauser Proline Promass I 100 - Page 41

Proline Promass I 100 Modbus RS485 System integration
Endress+Hauser 41
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 individual Modbus register address,
please refer to the additional document on Modbus RS485 register information
(  93)
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
Carried out using the operating menu of the measuring device:
Expert  Communication  Modbus data map  Scan list register 0 -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