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Script Modules
Ignition's Shared and Project Script Modules are global libraries of scripts that can be called from anywhere within their scope. Shared Script Modules are available to the whole Gateway, and Project Script Modules are available anywhere in that project. These scripts are organized as named modules that all live under the shared or project module. To open the Script Module Editor find the shared or project Script Library and double-click it in the Project Browser.
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Rule of Thumb: Never Copy-and-Paste a Script
If you're unsure of when to put scripts in a script module vs. writing the script directly in an event handler, follow this simple rule: If you ever find yourself copying a script from one event handler to another, stop and refactor the script into a global script module! Then simply call your new module from the event handler. This rule will help prevent code duplication across your project, a major maintenance liability.
How to use Script Modules
To add a script module, simply right click the Script Library [project] package and click the New Script option. Each module is a python script that may define many functions. You may also organize modules in subpackages if you'd like. Lets suppose you added a script module named myfuncs, whose body was:
def callMe(message):
system.gui.messageBox(message)
Now, anywhere in your project you can call this function:
project.myfuncs.callMe('Hello World')
To import System or not to import System
Frequently in Ignition, your scripts get system (the built-in library package in Ignition) and shared or project imported for you automatically.
Subsequent versions of Ignition beyond version 7 no longer need import system every time you create a new scope. However versions prior to version 7 still require an import system every time a system associated function is called inside a function. Ignition versions prior to version 7 still need the import system when system functions are called inside functions. Regardless, typing import system in any version of Ignition will result in the system library being available for use inside the function.
Project Scripts
Learn to use the project script library to consolidate frequently used script logic into one place.
Shared Scripts
Shared Scripts effectively allow you to create your own Python libraries that are stored on the gateway. Once created, these scripts may be called from any resource on the Gateway. Shared Scripts use normal Python syntax, and require you to define each function in the library.
Consider the following function that would calculate OEE:
def caclulateOEE(lineNum):
paths = ["[default]Metrics/Line_%f/Quality" % lineNum,
"[default]Metrics/Line_%f/Availability" % lineNum,
"[default]Metrics/Line_%f/Performance" % lineNum]
values = system.tag.readAll(paths)
#Get your Q, A, and P
quality = values[0].value
availability = values[1].value
performance = values[2].value
#calculate OEE
oee = quality * availability * performance
#Write back to our OEE tag.
system.tag.write("[default]Metrics/Line_%f/OEE" % lineNum, oee)
This could be defined as a Shared Script:
This could then be called from a script by calling shared.LibraryName.FuncitonName():
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