Mori Seiki Ex Alarm List Updated -

The Ultimate Guide to the Mori Seiki EX Alarm List: Diagnostics and Solutions

Introduction

For any machinist, setup technician, or maintenance engineer running a Mori Seiki (now DMG MORI) CNC lathe or machining center, few things are as jarring as a sudden halt in production accompanied by a cryptic EX alarm on the control panel. Unlike standard CNC machine alarms (which often relate to servo overloads or program errors), EX alarms are machine manufacturer-specific. They are the machine tool builder’s way of telling you about a hardware limit, a missing input signal, or a safety violation.

Kenji didn’t blame him. The "EX" in the alarm list stood for "External," a catch-all for everything the main NC (Numerical Control) couldn’t categorize. It was the machine’s shadow language, a place where hardware failures, PLC (Programmable Logic Controller) logic conflicts, and user errors all bled together. Unlike a simple "OVERLOAD" alarm, an EX alarm required detective work. mori seiki ex alarm list

Always start by verifying the obvious: hydraulic fluid levels, door closures, and chip conveyor jams. When those fail, access your machine’s PMC message history or log into the DMG MORI service portal with your serial number. For the rare, undocumented EX alarm, reading the PLC ladder directly is your ultimate fallback. The Ultimate Guide to the Mori Seiki EX

Keep a printed EX alarm quick-reference sheet near your machine’s electrical cabinet. Train every operator to differentiate between an EX alarm (usually a recoverable condition) and an NC alarm (requires deeper technical intervention). And finally, use historical EX alarm data to drive predictive maintenance—because the best downtime is the one that never happens. EX1051 corresponds to address R1000

Example (Fanuc 31i):

• EX1051 corresponds to address R1000.1 in the PMC.
• If R1000.1 = 1, the alarm is active. Go to the PLC ladder and search for R1000.1 to see what physical input (X address) triggers it.