Chapter 8 20 Points RS485 type Models Instruction
206
Detail instruction
Remote IO function
Function Description:
Remote IO function can make one SG2 as master link to another SG2 as slaver; the master can perform its
program, but the slaver can’t. The ON/OFF state of the output coil Q in slaver will affect the ON/OFF state of the
expansion output coil Y in master. In addition, the ON/OFF state of input coil X in master depends on the state of the
input coil I in slaver.
I/O Address
Master
Slave
Input Coils
I01~I0C
Output Coils
Q01~Q08
Expansion Input Coils
X01~X0C I01~I0C
Expansion Output Coils Y01~Y08
Q01~Q08
Hardware Configuration:
1. Link two “V” type SG2 as illustration show below.
2. Assign left SG2 in the illustration as master.
3. Set another SG2 to Slave.
The program in master is valid, but the one in slaver is not.
Don’t use expansion DI/DO modules, when remote I/O function is enabled.
Example:
Create a Ladder program as show below is written in master.
X02
―――――――
Y01
X03
―――――――
Y02
If input coils I02 and I03 in the Slaver turn ON. X02 and X03 in master will also turn ON due to the influence of
I02 and I03 in the Slaver. Obviously, Y01 and Y02 in the master will turn ON, and then it causes Q1 and Q2
switching ON. See the consequence on the IO interface as shown in below.
I/O State on Slave Run mode I/O State on Master Run mode
I .1
2 3
4 5 6 7 8 9 0 A B C
Z.1 2 3 4
Q.
1 2
3 4 5 6 7 8 9 0 A B C
MO 14 : 42
X. 1
2 3
4 5 6 7 8 9 0 A B C
Y.
1 2
3 4 5 6 7 8 9 0 A B C
EXE
2010.05.09
Set to master
Set to slaver
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