Diagnostics

A machine can look completely normal and still have something under it that is not running. The positions update, the axes jog, and the interlocks that are supposed to stop all of that are not executing.

This screen answers which of three things is wrong: the link between the panel and the machine, the control itself, or the PLC. It is on APPS → DIAGNOSTICS.

The three rows

Row	Reads	Means
Communication	Online	the panel is talking to the machine
	Offline	it is not, and nothing on any screen is current
Controller	Ready	the control is running and producing live values
	Config Mode	the machine is not active
	Stalled	the control is in run mode but has stopped producing values
	Unknown	there is no link, so there is nothing to report
PLC	Running	the machine’s logic is executing
	Stopped	it is not, and the control is in run mode
	Stopped (Config)	it is not, and neither is the control
	Unknown	there is no link

Green is healthy, amber is a state you chose, red is a state you did not.

PLC Stopped is the dangerous one

The PLC is where the machine’s interlocks live: the door, the guards, the air and coolant gates, and the software emergency stop. When it is stopped and the control is still in run mode, none of that is running while the axes still move.

The panel says so itself:

PLC stopped — interlocks and software E-Stop inactive

Treat the machine as unguarded until this row reads Running again. Do not jog, do not start a program, and do not rely on the software emergency stop. The hardwired emergency stop is a separate circuit and is not affected.

Stopped (Config) is the same PLC state with the control also out of run mode, which is the ordinary condition while a machine is being configured.

Stalled means the numbers are stale

Stalled is the control in run mode with nothing coming back from it. Every position, feed and spindle figure on every screen is the last value that arrived, however old. The panel raises this over the whole screen:

RUNTIME STALLED — DISPLAYED VALUES ARE NOT LIVE

A reading you cannot trust is worse than no reading, which is why this one takes the banner rather than sitting quietly on a status row. The same goes for Offline: the panel keeps drawing the last machine it saw.

What this screen does not do

• It does not command anything. Every row is a reading.
• It does not say why. It tells you which layer stopped, not what stopped it. For that, see Alarms & Events.
• It is not a substitute for the machine lamps. READY, DOOR and E-STOP on the Status Monitor answer “why will it not start” for a machine whose control and PLC are both healthy.

Where to go next

• Status Monitor: the machine’s own condition, once the control underneath it is healthy.
• Machine I/O: the inputs and outputs the PLC is acting on.