Nor-Cal SDC15 Controller - Manual (Page 31)

2 - 3 Operation Modes
The following shows the transition of operation modes:
RUN: Control status
READY: Control stop status
AUTO: Automatic operation (This unit automatically determines the MV values.)
MANUAL: Manual operation (The MV values are operated manually.)
AT: Auto tuning (The PID constants are set automatically using the limit cycle.)
ST: Self-tuning (The PID constants are set automatically while the control is kept continuously.)
2-9
Chapter 2. OUTLINE OF FUNCTIONS
AT stop
ST stop
AT stop
ST stop
AT stop
ST stop
AT stop
ST stop
AT running ST running
RUN + MANUAL mode
AUTO/MANUAL AUTO/MANUAL
RUN + AUTO mode
READY + AUTO mode
RUN + MANUAL mode
RUN/READY
RUN/READY