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4.1.3 Reading from and Writing to the GX/GP from Other Devices

Other devices (client devices) can transmit commands to the GX/GP to read data from and

write data to the GX/GP internal registers. By writing data to the GX/GP internal registers,

you can control the GX/GP (such as start recording).

For details on the function codes that the GX/GP supports and the GX/GP registers that

client devices can access, see page 4-11 in section 4.5, “Modbus Function and Register

Assignments”.

Specifying Register Numbers

On client devices, specify the GX/GP registers as follows:

• If you are using a commercial SCADA system or something similar, specify the register

number (a number such as 400001; referred to as the “reference number”) listed in

page 4-11 in section 4.5, “Modbus Function and Register Assignments”.

• If you are using a custom communication program, specify the “relative number” in

relation to the reference number. Derive the relative number in the manner indicated in

the examples below.

Examples

The relative number for input register 300100 is 99, which is the difference between

300100 and 300001.

300100 – 300001 = 99

The relative number for input register 400011 is 10, which is the difference between

400011 and 400001.

400011 – 400001 = 10

4.1 Using Modbus/TCP to Enable Other Devices to Read Data from and Write Data to the GX/GP (Modbus server function)

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