ladder logic programming software

although programs written in relay ladder logic cannot directly manipulate the microcontroller’s internal hardware as easily as the assembly language, such programs are however much easier to write and are generally understood by all electricians around the world who need not have any knowledge about microcontrollers at all. thanks to our extremely powerful yet very user-friendly relay ladder logic editor-cum-simulator software – trilogi, programming h-series plc become an almost trivial task. as you may observe from the above screen, you can see that all i/os may be defined using very meaningful names such as start, stop, etc. to add an element to the ladder diagram, you simply press the key and pick an item from the insert element pull down menu as shown above. to insert a special function, select item “9” or “0” (for multiple function) and the special function menu will appear as described in the next section. [ilock],[iloff] – this is equivalent to a master relay with sub-branches as illustrated below: figure 4: [ilock] function & its equivalence while constructing your ladder program you can simulate it using trilogi’s unique real-time simulator.




you can move the highlight bar to any i/o and press the key to toggle its status and the status of all the other i/os will be immediately updated according to the ladder program. a red “*” symbol means an i/o is on whereas a grey “.” it also permits you to pause the plc and remotely forced-set or reset any i/os or even modify the current value of the internal timers and counters. the i/o status can either be monitored on a full screen display similar to the simulator-screen, or directly on the ladder diagram. in trilogi all the i/os must be defined with unique label names prior to using them to construct the ladder program. any experienced programmer would be know that a program with meaningful names is far easier to create, debug and maintain than one made up of numbers only. trilogi allows you to set password protection on the target plc to prevent unauthorized uploading of your ladder program.

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