Modbus Registers used by the Realflo flow computer in Realflo 7

When a Realflo flow computer is loaded and running in a SCADAPack controller, the flow computer reserves a range of Modbus registers for flow computer use only.  Modbus registers that are not being used by the flow computer may be used by the logic program.


The following tables illustrate which Modbus registers are reserved by the flow computer and which Modbus registers are available for use by the controller logic.


The same is true for the older ‘legacy’ SCADAPacks, the newer SCADAPack32 and SCADAPack 300 series controllers as well as for the newest SCADAPack x70 controllers.

Realflo Reserved Modbus Registers

The Realflo Flow Computer reserves the following hard-coded set of Modbus Registers.

Register Type	5-Digit Addressing Range	6-Digit Addressing Range
Discrete Coils	3800 – 4096	3800 – 4096
Discrete Inputs	N/A	N/A
Input Registers	34000 – 39999	304000 – 313999
Holding Registers	42000 – 49999	402000 – 411999

Realflo Registers Available for Users for standard SCADAPack Controllers

The following Modbus Registers are available for use with ladder logic programming.

Register Type	5-Digit Addressing Range	6-Digit Addressing Range
Discrete Coils	00001 – 03799	00001 – 03799
Discrete Inputs	10001 - 14096	10001 - 19999
Input Registers	30001 – 33998 *	300001 – 303998 *
Holding Registers	40001 - 41998	400001 – 401998

* For SCADAPack 32 and 3xx controllers (i.e. SP32, SP334, SP357, etc) the ‘Input Registers’ range is 30001 – 39999 and 300001 – 303998
For older SCADAPack controllers (i.e. SCADAPack,  SCADAPackLP, SCADAPack100, etc) the ‘Input Registers’ range is 30001 – 31024 and 300001 - 301024

Realflo Registers Available for Users for x70 Controllers

The following Modbus Registers are available for use with ladder logic programming.

Register Type	5-Digit Addressing Range	6-Digit Addressing Range
Discrete Coils	00001 – 03799, 04097 - 09999	00001 – 03799, 04097 - 09999
Discrete Inputs	10001 - 14096	10001 - 19999
Input Registers	30001 – 33998	300001 – 303998
Holding Registers	40001 - 41998	400001 – 401998, 412000-465536

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