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The most common cause of this error is selecting the wrong "Controller Type" during configuration. When configuring a Quantum PLC with ProWORX NxT, you must select the correct executive firmware for the "Controller Type". Below is the Change Controller Type "Pick List". If the Quantum PLC has version 2.XX firmware, you need to select Rev 2 for the PLC Type. "Quantum 113/3 is for version 1.XX firmware" and "Quantum 113/3 REV 2" is for version 2.XX firmware.