The (e.g., NL2500, DuraTurn 2050, NH4000) The control system type (e.g., Fanuc, Mitsubishi, MAPPS IV)
You can think of it as the difference between the CNC's operating system (NC alarms) and a custom application program running on that system (EX/PLC alarms). An EX alarm doesn't necessarily mean the CNC core has a fault; rather, it means the machine's unique "personality"—as programmed by Mori Seiki—has encountered an unexpected condition. This is why you won't find a single, universal list for all EX alarms from a Fanuc manual; it's machine-specific.
Mori Seiki machines categorize faults using specific lettering systems. Knowing the difference helps you isolate the hardware or software root cause immediately. mori seiki ex alarm list
A Mori Seiki NLX2500 lathe suddenly stops mid-cycle with EX1506 (Turret index time out). The operator resets but the alarm returns every 3-4 parts.
Triggered by the Fanuc/Mitsubishi core (e.g., servo errors, axis overtravel, memory errors). The (e
These come from the main computer control (like Fanuc or Mitsubishi). They usually mean there is a software error, a movement limit issue, or a drive failure.
Refill the way lube tank immediately. If full, check for a broken lube line causing a pressure leak, or a faulty pressure switch. EX0201 - Coolant Level Low The operator resets but the alarm returns every 3-4 parts
Proper pressure and lubrication are critical to prevent catastrophic mechanical wear on the ways, ballscrews, and spindles.
Mori Seiki CNC machines are famous for their reliability and precision. However, when an EX alarm appears on your MSG or MAPPS control panel, production grinds to a halt. Unlike NC alarms (which relate to core Fanuc or Mitsubishi control system faults), EX alarms are external system alarms defined by Mori Seiki. They signal issues with the machine's peripheral hardware, safety switches, fluid levels, and mechanical systems.