Endress+Hauser Proline Promass I 100 - Register Information; Response Time; Modbus Data Map

System integration Proline Promass I 100 Modbus RS485
40 Endress+Hauser
Code Name Description Application
06 Write single
registers
Master writes a new value to one
Modbus register of the measuring
device.
Use function code 16 to write
multiple registers with just 1
telegram.
Write only 1 device parameter
Example: reset totalizer
08 Diagnostics Master checks the communication
connection to the measuring device.
The following "Diagnostics codes"
are supported:
• Sub-function 00 = Return query
data (loopback test)
• Sub-function 02 = Return
diagnostics register
16 Write multiple
registers
Master writes a new value to
multiple Modbus registers of the
device.
A maximum of 120 consecutive
registers can be written with 1
telegram.
If the required device
parameters are not available
as a group, yet must
nevertheless be addressed
with a single telegram, use
Modbus data map
(  40)
Write multiple device parameters
Example:
• Mass flow unit
• Mass unit
23 Read/Write
multiple
registers
Master reads and writes a
maximum of 118 Modbus registers
of the measuring device
simultaneously with 1 telegram.
Write access is executed before
read access.
Write and read multiple device
parameters
Example:
• Read mass flow
• Reset totalizer
Broadcast messages are only allowed with function codes 06, 16 and 23.
9.2.2 Register information
For an overview on Modbus-specific information of the individual device parameters,
please refer to the additional document on Modbus RS485 register information
(  93)
9.2.3 Response time
Response time of the measuring device to the request telegram of the Modbus master:
typically 3 to 5 ms
9.2.4 Modbus data map
Function of the Modbus data map
The device offers a special memory area, the Modbus data map (for a maximum of 16
device parameters), to allow users to call up multiple device parameters via Modbus RS485
and not only individual device parameters or a group of consecutive device parameters.
Grouping of device parameters is flexible and the Modbus master can read or write to the
entire data block simultaneously with a single request telegram.