Varec 8315 Series manual Fixed Modbus Map, Function Code Description Comments

8315 L&J Tankway Software Description TankGate Interface

TankGate responds to the following Function Codes:

Function Code	Description	Comments
3	Read Output	FC 3 and FC 4 are treated the same. Use either FC 3 or FC 4
	Register	to read data from the TankGate
4	Read Input
	Register
5	Force Single	FC 4 and FC 6 are treated the same. Use either FC 5 or FC 6
	Output	to write data to the TankGate
	Status
6	Preset Single
	Register
15	Force	FC 15 and FC 16 are treated the same. Use either FC 15 or
	Multiple	FC 16 to write multiple registers to the TankGate
	Outputs

16Preset Multiple Registers

There are two methods for data addressing within the TankGate

•The TankGate has a fixed Modbus Map of selected parameters

•Gateway Block (GWBLK) software blocks can be configured to set the data address

4.5.2Fixed Modbus Map

For each version of the TankGate, there is a fixed map of data registers. A partial example is shown below:

Address	Type	Number	Parameter	Data Type
5000	WV1900	0	Command	CODED
5001	WV1900	0	Level	REAL
5003	WV1900	0	Temp	REAL
5005	WV1900	0	Value	REAL
5007	WV1900	0	Status	HEX
5008	WV1900	0	PntStatus	IHEX
5009	WV1900	0	Elapse	TIME
5011	WV1900	1	Command	CODED
5012	WV1900	1	Level	REAL
5014	WV1900	1	Temp	REAL
5016	WV1900	1	Value	REAL

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