KROHNE IFC 050 Converter Modbus EN - Manual (Page 12)

6
MODBUS PROTOCOL
12
IFC 050
www.krohne.com 09/2012 - 4002202601 - AD Modbus IFC 050 R01 en
6.7 Input registers
All input registers in the Modbus protocol address range from 30000 to 38998 are mapped into
the range 0 to 8998. All input registers in the Modbus protocol address range from 20000 to
20998 are mapped into the range 9000 to 9998. This is done to give systems with restriction on
the address range access to the device.
Measurement and status values are read only and can be accessed as Modbus "Input Registers".
Cyclic GDC objects are mapped to Modbus Registers.
Function code is 04 (0x04).
Input register 30018 is not used up to now. This is included to fill the gap between the float and
double float values and allows to read the full range of registers.
Also the result of a calibration procedure is accessed by an input register at Modbus Protocol
Address 20000 or 9000. The type are one or more float values. This is depending on the used
function (refer to "Calibration procedures").
Modbus protocol
address Description and settings Type Number of registers
1st 2nd
30000 0 flow speed flow speed flow speed flow speed [m/s] float 2
30002 2
volume flow volume flow volume flow volume flow [m 3 /s]
float 2
30004 4 mass flow mass flow mass flow mass flow [kg/s] float 2
30006 6 Operating time Operating time Operating time Operating time [s] float 2
30008 8 Counter 1 Counter 1 Counter 1 Counter 1 [m 3 ] or [kg] double float 4
30012 12 Counter 2 Counter 2 Counter 2 Counter 2 [m 3 ] or [kg] double float 4
30016 16 long status sensor long status sensor long status sensor long status sensor byte [4] 2
30018 18 long status device long status device long status device long status device byte [4] 2
Modbus protocol
address Description and settings Type Number of registers
1st 2nd
20000 9000 Result of a calibration function one or more float
values
2 times number of
values