ONICON F-3100 MOD - Manual (Page 10)

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F-3100-MOD Flow Meter Network Interface Installation Guide 05/14 - 0725-1 Page 10
SECTION 2.0: MODBUS MEMORY MAP
ONICON F-3100 Inline Electromagnetic Flow Meters provide flow rate data, totalized flow data, and
operating status data via the MODBUS RTU RS485 serial communications interface. MODBUS data is
available in the same engineering units shown on the meter’s display.
2.1 MODBUS REGISTER FORMAT AND NETWORKING INFORMATION
All registers are 16 bit MODBUS Holding Registers.
Only one MODBUS function code is supported. It is function code 3, reading holding registers.
Floating point data conforms to IEEE754 format.
Long integer (32-bit) data is formatted with the high order word (MSW) on the even addrss and
the low order word (LSW) on the odd address.
Register
Address
Description Register Type Comment
001 Flow rate as a % of full scale Floating Point (1 of 2)
002 Flow rate as a % of full scale Floating Point (2 of 2)
003 Current flow rate Floating Point (1 of 2)
004 Current flow rate Floating Point (2 of 2)
005 Positive flow total Scaled Long Integer (1 of 2) Register values must be
scaled according to the
number of decimal points
shown on the flow meter
display.
Example:
Displayed value - 226.794
Register value - 226794
Scale multiplier - 0.001
006 Positive flow total Scaled Long Integer (2 of 2)
007 Partial positive flow total Scaled Long Integer (1 of 2)
008 Partial positive flow total Scaled Long Integer (2 of 2)
009 Negative flow total Scaled Long Integer (1 of 2)
010 Negative flow total Scaled Long Integer (2 of 2)
011 Partial negative flow total Scaled Long Integer (1 of 2)
012 Partial negative flow total Scaled Long Integer (2 of 2)
013 Run time clock in seconds Long Integer (1 of 2)
014 Run time clock in seconds Long Integer (2 of 2)