Chapter 8 20 Points RS485 type Models Instruction 210
In Ladder mode, there are 5 parameters in Modbus function as shown in below.
More description and examples to see Chapter5: Relay Ladder Logic Programming-MU (Modbus).
※ The max data length for Mode 1 and 3 is 25words. The max data length for Mode 4 is 400bits.
In FBD mode, program, edit and parameter display as shown blow;
Mode1 FBD display Parameter display
Enable Input
→ ←
Slave ID
←
Register address
Parameter
→
←
Saving data address
More description and examples to see Chapter6: FBD Block Diagram Programming-MU (Modbus) function
block.
※ The max data length for Mode 1 and 3 is 25words. The max data length for Mode 4 is 400bits.
①
MU mode (1~5)
②
ID number of the target unit: range from 0 to127
③
The address of target register in that unit:
1) address is assigned to a constant, range from 0000 to ffff;
• Just do the read/write function to the register with one data
length/address in mode 1 and 3.
• Do the read/write function to the coil with one data
length/address in mode 4 and 5.
2) The address refers to the content of DR coil, and the value of coil
behind this one determines how many registers or coil will be read or
write, see the next five pages for more information.
④
DR code, store sending/receiving data from this DR
⑤
MU code (MU01~MU0F)
To Next Page
Loading...