Figure 43 - Modscan32, Data Definition; Table 16 - Modbus Service Data - FCI MT100 Installation, Operation And Maintenance Manual

MT100 Multipoint Flow Meter
MT100 Modbus Service Registers
The MT100 Modbus supports service registers Totalizer Reset and Totalizer Start/Stop.
● Reset Command for Totalizer – Use the Function 03 holding command via 4117 integer register to manually reset the MT100 totalizer
count. This is a write only command. If another master has control on write, the function returns a "write protected" error message.
● Start/Stop Command for Totalizer – Use the Function 03 holding command via 4118 integer register to manually start or stop the totalizer
count. This is a read/write command. If another master has control on write, the function returns a "write protected" error message.
Service and Setup Functions
To reset the totalizer write 0xABCD
To start the totalizer write 0x01
To stop the totalizer write 0x00
Examples of Totalizer Service Register Access using ModScan32
ModScan32 is a Windows-based utility by WinTECH Software that lets a PC operate as a Modbus master device for testing Modbus
systems. Connect the instrument's Modbus terminals to one of the host PC's COM/USB port (a USB connection will require a USB to RS­
485 Serial Adapter).
Setting Up ModScan32, Checking the Totalizer 1 (Lower Count) Value
1. Start the ModScan32 program and set the data definition (register #4111 and #4112) as shown in the figure below. (Set Length to "2"
to include the 2
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Table 16 – Modbus Service Data
Variable/Parameter
Totalizer Reset
Totalizer Start/Stop
Totalizer 1 Max MS
Totalizer 1 Max LS
subsequent register, 4112.)
nd
Figure 43 – ModScan32, Data Definition
Modbus Slave Register
4117
4118
4115
4116
Data Type Access
Write Only
Integer
(Function 03)
Read/Write
(Function 03)
Integer
Read (Function 04)
Read/Write
Float
(Function 03)
Read/Write
Float
(Function 03)
OPERATION
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