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⑤ Read the project from the Master PLC then execute the monitor mode, at the screen to add and monitor the
components D0, D1, D10 and D11.
④ After sequentially edit and load the projects to those PLCs, do the wiring jobs between three PLCs. Then, connect
the computer to the USB programming port of the Master PLC, to test and monitor the process through the
Ladder Master S.
When the example is performing, the data at every PLC will follow its own program and the “LINK_TEST”
communication table to execute the operation below.
1. The content value of Master's D0 is written into the D0 at the Slave PLC #1 via communication (the rst
command in the communication table). At the Slave #1, the content value of D0 is sent to its output points
Y0~Y7.
Therefore, when the value of Master's D0 is 1, the Y0 at the Slave #1 turns “ON”; when the value of Master’s D0
is 5, the Y0 and Y2 at the Slave #1 turn “ON”, and so forth.
At the PLC Slave #1, its content value of D0 will be added 100 up and stored to the D1.
Afterward, the PLC Master reads the value of D1 at the Slave #1 via the communication and stores the value to
the Master's D10 (the second command in the communication table).
Thus, to observe the value of D10 at the Master that is always equal to the content value of D0 added up to 100
if the communication is successful.
2. The content value of Master's D1 is written into the D0 at the Slave PLC #2 via communication (the third
command in the communication table). At the Slave #2, the content value of D0 is sent to its output points
Y0~Y7. Therefore, when the value of Master's D1 is 1, the Y0 at the Slave #2 turns “ON”; when the value of
Master's D1 is 7, the Y0, Y1 and Y2 at the Slave #1 turn “ON”, and so forth.
At the PLC Slave #2, its content value of D0 will be added 100 up and stored to the D1.
Afterward, the PLC Master reads the value of D1 at the Slave #1 via the communication and stores the value to
the Master's D11 (the fourth command in the communication table).
Thus, to observe the value of D11 at the Master that is always equal to the content value of D1 added up to 100
if the communication is successful.
By the VS Computer Link communication, the LINK instruction and its table at the Master PLC that produces the
following results:
1. The content value of the Master's D0 is output to the points Y0~Y7 of the Slave #1.
2. The content value of the Master's D10 equals to the sum of the content value of its D0 and 100.
3. The content value of the Master's D1 is output to the points Y0~Y7 of the Slave #2.
4. The content value of the Master's D11 equals to the sum of the content value of its D1 and 100.
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