Chapter 6 Server function and P2P service
6-3
Code Purpose Address
Max. no. of response
data
01 Read Coil Status 0XXXX 2000 Coils
02 Read Input Status 1XXXX 2000 Coils
03 Read Holding Registers 4XXXX 125 Registers
04 Read Input Registers 3XXXX 125 Registers
05 Force Single Coil 0XXXX 1 Coil
06 Preset Single Register 4XXXX 1 Register
15 Force Multiple Coils 0XXXX 1968 Coils
16 Preset Multiple Registers 4XXXX 120 Registers
[Table 6.1.1] Modbus instruction code
About request per above code, you should set area about XGB PLC memory. At ‘Modbus Settings
of Cnet active mode’ window, if you click “Modbu Settings” button which is activated when
selecting Modbus ASCII server/RTU server, the following setting window shows.
[Figure 6.1.2] Modbus server memory settings window
Meaning of each setting item is as follows.
Item Meaning Reference
Bit read area Address Address of XGB relevant to digital Input area Bit address
Bit write area Address Address of XGB relevant to digital output area Bit address
Word read area Address Address of XGB relevant to analog input area Word address
Word write area Address Address of XGB relevant to analog output area Word address
[Table 6.1.2] Modbus area meaning
In case of IEC type, use IEC type address value
Address value of each item is base address of each area.
The setting of above screen is the situation of allocating bit reading are from M0000 (bit)
and Word writing area from D0000 (word).
Base address input value should be in XGB series internal device area.
To Next Page
Loading...
Need help?
General
