Ro Float; Rw 8/16-Bit - ABB AquaMaster 3 Manual

AquaMaster 3
Electromagnetic flowmeter

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
Address
Function
Starting Address Hi
Starting Address Lo
Quantity of Inputs Hi
Quantity of Inputs Lo
CRC
CRC

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
Address
Function
Starting Address Hi
Starting Address Lo
Quantity of Inputs Hi
Quantity of Inputs Lo
CRC
CRC
MODBUS Tables Supplement COI/FET2XX/MOD/TBL-EN
(Hex) Response Message
01 Address
04 Function
13 Byte count
a8 H Register Value Hi
00 H Register Value Lo
02 L Register Value Hi
f4 L Register Value Lo
af CRC
CRC
(Hex) Response Message
01 Address
03 Function
1f Byte count
48 Register Value Hi
00 Register Value Lo
01 CRC
03 CRC
c8
(Hex) Error Message
01 Function
04 Exception Code
04
41
20
=10.0
00
00
ee
72
(Hex) Error Message
01 Function
03 Exception Code
02
00
=50
32
39
91
MODBUS Protocol
(Hex)
84
Exception Code
(Hex)
83
Exception Code
8