Is there a simulator out there that can emulate different PLC's; such as AllenBradley's, ROC's, SCADAPacks?
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I'm not aware of a generic one. Certainly not one that actually runs the target's code.
If you need to emulate a Modbus device, my Advanced Modbus driver's server mode will likely suffice, if you write some gateway timer scripts to implement the emulation behaviors.
Similarly for a Rockwell ControlLogix/CompactLogix and my EtherNet/IP driver. (With that, you can import an L5X file to create the tags and data types, so you only have to write scripts for the behavior.)
And yes, these two solutions are targetable by external systems using those native PLC protocols.
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