How to: Inverting Bits
The guide demonstrates how to create an expression that will invert the bits of a given tag. Before starting, create a local Modbus device, a tag with the name source_tag and data format WORD (16-bit unsigned integer).
Open Monokot Server Administrator, double-click Scripts on the Server Explorer pane and go to the Modules tab. Click the New Module button and name the module BitsOp. Insert the following code into the code editor:
Press Ctrl + Enter to apply the change in the code editor.
Thus, the following functions are defined in the BitsOp module:
bit_test: returns the state (true or false) of the bit number bit from the number num
bit_set: sets the bit number bit of the specified number num to true and returns the resulting number
bit_clear: resets the bit number bit of the specified number num to false and returns the resulting number
bit_toggle: inverts the bit number bit of the specified number num and returns the resulting number
Go to the Expressions tab and click the New Expression button. For the expression that appeared, set the name Inverse and specify the data type WORD (16-bit unsigned integer). Insert the following code into the expression code editor:
Press Ctrl + Enter to apply the change in the code editor.
While in the code editor you can check the syntax by pressing the F9 key
Go to the Triggers tab and click Add Data.... Select the previously created tag (source_tag) as the data source for the trigger. Enter source_tag_trig as the name (key) of the trigger.
Go to the Imports tab and click the checkbox of the BitsOp module.
In order for the changes to take effect on the server, click the Sync button. If you switch to Go Online mode, you will see a picture similar to the following (in my case, the number 21845 is inverted).
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