Instructions

Circuit program development
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Fig. 7.19
 Connect the network variable output block to the desired block in the workspace.
Fig. 7.20
If the network output variable block is used for requesting a slave, it receives an addi-
tional parameter Write at the end of cycle. If the parameter is set to Yes, the new value
of the variable is assigned only at the end of the cycle, when all input variables are al-
ready read out.
Fig. 7.21
Note: A variable cannot be coupled with a block if there is no communication interfaces in
the device settings.
7.7 Read / write in FB
The block WriteToFB is used to change an FB parameter during the process.
Example:
The value of the parameter ON-duration of the FB BLINK1 should be 2 or 10 depending
on the value at the input I5.
To add the block WriteToFB to the program, click the icon in the toolbar Insert (Table
2.6), then click the desired place in the workspace.
Go to Property Box, select the FB BLINK1 in the row Function block and the parameter
of the FB in the row Parameter in FB (Fig. 7.22).