ABB AquaMaster 3

AquaMaster 3
Electromagnetic flowmeter
MODBUS Tables Supplement COI/FET2XX/MOD/TBL-EN 8
MODBUS Protocol
1.3.6 RO Float
Read-only access to float types.
Each AquaMaster 3 float type requires 2 MODBUS Registers (4 bytes). Consequently, RO float Register
addresses are assigned at intervals of 2 and the Request Message must provide Quantity of Inputs in
multiples of 2.
Float values use IEEE-754 format arranged in big-endian order.
Read Input Registers 5033 to 5034
var237 – Calibrated bore
Request Message
(Hex)
Response Message
(Hex)
Error Message
(Hex)
Address
01
Address
01
Function
84
Function
04
Function
04
Exception Code
Exception Code
Starting Address Hi
13
Byte count
04
Starting Address Lo
a8
H Register Value Hi
41
Quantity of Inputs Hi
00
H Register Value Lo
20
Quantity of Inputs Lo
02
L Register Value Hi
00
CRC
f4
L Register Value Lo
00
=10.0
CRC
af
CRC
ee
CRC
72
1.3.7 RW 8/16-Bit
Read/write access to 8- and 16-bit types.
8-Bit quantities use the Lo byte of Register Value. The Hi byte is 'don't care' and can be set to value 0 in
Request Messages and shows value 0 in Response Messages.
Read Holding Register 8009
var69 – Pulse maximum frequency
Request Message
(Hex)
Response Message
(Hex)
Error Message
(Hex)
Address
01
Address
01
Function
83
Function
03
Function
03
Exception Code
Exception Code
Starting Address Hi
1f
Byte count
02
Starting Address Lo
48
Register Value Hi
00
Quantity of Inputs Hi
00
Register Value Lo
32
=50
Quantity of Inputs Lo
01
CRC
39
CRC
03
CRC
91
CRC
c8