Buffer Memory Details; Bfm#0] Flag - Mitsubishi Electric MELSEC FX Series User Manual

FX -4LC User's Manual
3U
8.2

Buffer Memory Details

8.2.1

[BFM#0] Flag

The ON/OFF status of each bit indicates the status of the 4LC.
BFM No.
CH1 CH2 CH3 CH4
#0
Flag
Bit
b0 Error present
b1 Set value range error
b2 24V DC power supply error
b3 Set value backup error flag
b4 CH1 AT/ST abnormal end flag
b5 CH2 AT/ST abnormal end flag
b6 CH3 AT/ST abnormal end flag
b7 CH4 AT/ST abnormal end flag
b8 Adjustment data error
b9 Cold contact temperature compensation data error
b10 A/D converted value error
b11 Not used
b12 Controlling flag
b13 Set value being backed up flag
b14 Initialization completed flag
b15 Temperature control ready flag
Operation of temperature control ready flag (b15)
Once the power supply has been turned ON the 4LC is ready. Temperature control ready flag turns ON.
Temperature control
ready flag(b15)
Caution
• While the temperature control ready flag is ON, the 4LC accepts the FROM/TO instructions (or direct buffer
memory specification).
• The 4LC does not perform control for approximately 5 seconds after the power is turned ON.
Description
Flag (Refer to the following)
Item
ON 500ms maximum
OFF
Power is turned ON
Initial
value
Description
Turns ON when an error among b1 to b10 below has occurred.
Turns ON when data outside set range is written.
The buffer memory number in which an error has been generated is
stored in a set value range error address (BFM#252).
Turns ON when driving power supply (24V DC) is not supplied. The
control output of all channels is turned OFF.
Turns ON when an error has been caused by noise or when a
failure has occurred in the 4LC.
Turn the power ON again, and check for changes in the state. If no
improvement is obtained, consult a Mitsubishi Electric distributor.
Turns ON when CH1 AT (auto tuning) or ST (startup tuning)
abnormally ends.
Turns ON when CH2 AT (auto tuning) or ST (startup tuning)
abnormally ends.
Turns ON when CH3 AT (auto tuning) or ST (startup tuning)
abnormally ends.
Turns ON when CH4 AT (auto tuning) or ST (startup tuning)
abnormally ends.
Turns ON when an error has been caused by noise or when a
failure has occurred in the 4LC. The control output of all channels is
turned OFF.
Turn the power ON again, and check for changes in the state. If no
improvement is obtained, consult a Mitsubishi Electric distributor.
Turns ON when an error has been caused by noise or when a
failure has occurred in the 4LC. The control output of error channels
is turned OFF.
The error channels can be checked in the status of bits of Event
buffer memories (BFM#1 to #4).
Turn the power ON again, and check for changes in the state. If no
improvement is obtained, consult a Mitsubishi Electric distributor.
-
Turns ON when 4LC is performing control.
Remains ON while set values are being backed up.
Turns ON when Initialization completed
Turns ON when 4LC becomes ready for operation.
Temperature control CPU
ready for operation
8 Buffer Memory
8.2 Buffer Memory Details
R/W Backup
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