LSIS XGL-C22A, User Manual, Page: 81 / 299

Chapter 6 Communication Parameter
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Correspondent client device shall request within the range described in the table below.
For example, bit Read request is available up to 2000 bits, and bit Write request is available up to 1968 bits
(using Modbus RTU).
Code (Hex) Purpose Used area Address Max. Response data
01
Read Coil Status
BIT OUTPUT 0XXXX 2000 COILS
02 Read Input Status BIT INPUT 1XXXX 2000 COILS
03
Read Holding Registers
WORD OUTPUT 4XXXX 125 REGISTERS
04
Read Input Registers
WORD INPUT 3XXXX 125 REGISTERS
05
Force Single Coil
BIT OUTPUT 0XXXX 1 COIL
06
Preset Single Register
WORD OUTPUT 4XXXX 1 REGISTER
0F
Force Multiple Coils
BIT OUTPUT 0XXXX 1968 COILS
10
Preset Multiple Registers
WORD OUTPUT 4XXXX 120 REGISTERS
[Table 6.6.1] Modbus command code
For the request of each instruction code, applicable area shall be set for XGT PLC memory.
It is available through “Modbus Setting” window as shown in the figure below which is displayed if “Setting” button clicked
after active with Modbus ASCII server/RTU server selected on the “Modbus setting of Cnet operation mode” window.
[Figure 6.6.2] Modbus server memory setting
Details of respective setting item are as follows;
Item Description Remarks
DI area address XGT address applicable to digital input area Bit address
DO area address XGT address applicable to digital output area Bit address
AI area address XGT address applicable to analog input area Word address
AO area address XGT address applicable to analog output area Word address
[Table 6.6.2] Details of Modbus Area

The address value set in the respective item is the base address of the applicable area.

In the [Figure 6.6.2], start address of bit read area is assigned at the first bit of M0000 word. Start address of word