Modbus Register Map - McCrometer ProComm Max Installation, Operation And Maintenance Manual

6.4

MODBUS Register Map

Process data is contained in the transmitter's memory at specific addresses or registers and can be accessed by the MODBUS
function codes.
Table I: Read Input Registers (COMMAND 04)
Address Offset Size
0000-0001 32 bits (two 16-bit
registers)
0002 16 bits (one register) 16-bit UINT
0003-0004 32 bits (two 16-bit
registers)
0005-0006 32 bits (two 16-bit
registers)
0007 16 bits (one register) 16-bit UINT
0008 16 bits (one register) 16-bit UINT
0009-0010 32 bits (two 16-bit
registers)
0011-0012 32 bits (two 16-bit
registers)
0013-0014 32 bits (two 16-bit
registers)
0015-0016 32 bits (two 16-bit
registers)
Note: Starting address is 30001
Note: To read data, use Function Code 04
Note: Read-only
Table II: ProComm vs. ProComm Max
The table below compares addresses for the previous ProComm converter and the new ProComm Max transmitter, showing
which registers have changed to what new registers for Modbus are now.
Old Procomm Size
Address
0000-0001 32 bits (two 16-bit registers)
0004-0005 32 bits (two 16-bit registers)
0006-0007 32 bits (two 16-bit registers)
0008-0009 32 bits (two 16-bit registers)
0011-0012 32 bits (two 16-bit registers)
0014-0015 32 bits (two 16-bit registers)
0017-0018 32 bits (two 16-bit registers)
Note: Users upgrading from ProComm to ProComm Max can use this table to help navigate the new register map.
Type Data
32-bit Float Flow Rate
Flow Rate
(Unsigned Short) Units
32-bit UINT Totalizer (+)
(Unsigned Long)
32-bit UINT Totalizer (-)
(Unsigned Long)
Totalizer
(Unsigned Short) Units
Totalizer
(Unsigned Short) Multiplier
32-bit UINT Batch Total
(Unsigned Long) (+)
32-bit UINT Batch Total (-) Partial Total: P- value
(Unsigned Long)
32-bit Float Flow Rate
(linear)
32-bit Float Full Scale
Type
32-bit Float
32-bit Float
32-bit Float
32-bit UINT (Unsigned Long)
32-bit UINT (Unsigned Long)
32-bit UINT (Unsigned Long)
32-bit UINT (Unsigned Long)
Page 20
MODBUS PROTOCOL
Description
Flow rate (unit chosen in 0002)
Unit of measure for volumetric flow
rate (see Table III)
Totalizer: T+ value (unit chosen in
0007)
Totalizer: T- value (unit chosen in
0007)
Units of measure for Totalizer
(see Table IV)
Totalizer Multiplier value
(see Table V)
Partial Total: P+ value
Linear flow rate in ft/sec
Full scale flow rate
Data New ProComm
Max Adresses
Full Scale 0015-0016
Flow Rate 0000-0001
Flow Rate (linear) 0013-0014
Totalizer (+) 0003-0004
Batch Total (+) 0009-0010
Totalizer (-) 0005-0006
Batch Total (-) 0011-0012
30126-48 Rev. 1.0 | 23AUG2024