He pulled up the on the MAPPS IV panel. It wasn't just a list; it was a confession. The list was divided into sections: EX 1000s for tool management, EX 2000s for hydraulics, EX 3000s for safety interlocks. The problem was, the manual’s description for EX 1047 was frustratingly vague: "Abnormal load on magazine servo. Check physical interference and servo parameters."
What is the of your Mori Seiki machine (e.g., NLX 2500, NH4000)?
: Safety and Operation Alarms (e.g., Door Open, Emergency Stop).
You will need your machine's serial number. Once logged in, go to: Documentation → Electrical Diagrams → Alarm List (PLC Messages) . The EX list is usually in Appendix B of the maintenance manual.
Among the various alarm classifications, are unique. Unlike system or servo alarms that originate deep within the CNC control software or drives, EX alarms are generated by the machine's Programmable Logic Controller (PLC) or ladder logic. They generally point to issues with peripheral hardware, safety interlocks, fluid levels, or mechanical limits.
Since the EX series utilizes Fanuc controls (typically 16i/18i/21i or 0i-TD/TC), you will see standard Fanuc alarms.
EX alarms are a specific class of error messages on Mori Seiki (now DMG MORI) machine tools. The "EX" prefix indicates a , also frequently referred to as a "Machine Side Alarm." Unlike standard NC alarms generated by the core Fanuc or Mitsubishi CNC, EX alarms originate from the machine builder’s custom ladder logic. This logic governs all the mechanical and electrical actions specific to your machine model, such as tool changers, pallet systems, coolant pumps, chip conveyors, and safety interlocks.
– A spindle rotation command was given while the chuck was not securely clamped.
The interlock was turned during an automatic cycle or feed hold. High-Pressure Coolant System General abnormality in the coolant pump or system pressure. EX2595 Coolant Unit Filter Clogged The filter is restricted; it needs cleaning or replacement. EX2909 Door is Opening (Timer Power-on)
Imagine your machine tool is a living organism. The "EX" alarm is its nervous system—a signal from the Programmable Logic Controller (PLC) that something is out of balance. For any machinist, operator, or maintenance technician, the sudden appearance of an "EX" code on the control panel can be a moment of intense focus. While numerical control (NC) alarms, like the well-known 401 SERVO ALARM (for an Axis Drive Fault), usually indicate problems with the Fanuc control itself, EX alarms are different.
Do you have a appearing on your screen right now?
Mori Seiki "EX" alarms are PLC-related messages that originate from the machine tool builder rather than the underlying CNC control (such as Fanuc or Mitsubishi). These alarms typically indicate mechanical, electrical, or sequence-related issues specific to the machine's peripheral hardware, such as the hydraulic unit, automatic tool changer (ATC), or door interlocks.
When an alarm occurs on a Mori Seiki machine, refer to the Ex alarm list to diagnose and troubleshoot the issue. Here are some general steps to follow:
– Spindle, X-axis, or Z-axis is experiencing excessive load, possibly due to a crash or dull tooling. Maintenance & Fluid Alarms Electrical Cabinet Overheat