Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 2062

(274) Execute the PID instruction.
PID action is in progress.
(300) Check the auto tuning operation.
End the auto tuning processing.
Shift to the normal PID action.
(348) Heater output
Write the manipulated value (MV) to D/A converter module.
(381) Error
APPX
2060
Appendix 4 PID Operation Program Examples