Bfm#21 To 24] Heater Current Measured Value; Bfm#25 To 28] External Input Value; Bfm#29] Control Start/Stop Changeover; Bfm#30] Fx Series Model Code - Mitsubishi Electric MELSEC FX Series User Manual

FX -4LC User's Manual
3U
8.2.7

[BFM#21 to 24] Heater current measured value

These buffer memories store the heater current measured value entered from the current detector (CT).
BFM No.
CH1 CH2 CH3 CH4
#21 #22 #23
Caution
• These buffer memories handle numeric values containing decimal places, and store the actual value
multiplied by "10".
• When the control mode using external outputs is selected by the control mode switch function, the CT input
is not measured. In this case, these buffer memories always store "0".
• When heating/cooling PID control using external outputs is used control, the CT input is not measured. In
this case, these buffer memories always store "0".
8.2.8

[BFM#25 to 28] External input value

When the control mode using external outputs is selected by the control mode switch function, set a value
corresponding to the measured value (PV) to these buffer memories.
BFM No.
CH1 CH2 CH3 CH4
#25 #26 #27
Caution
• When the setting in the external input value is greater than the external input range upper limit +5%, it is
judged as an input upper limit error, and bit 0 of the event buffer memory (BFM#1 to BFM#4) turns ON.
• When the setting in the external input value is smaller than the external input range lower limit - 5%, it is
judged as an input lower limit error, and bit 1 of the event buffer memory (BFM#1 to BFM#4) turns ON.
8.2.9

[BFM#29] Control start/stop changeover

This buffer memory starts or stops control.
Write "K0" to stop control and select the monitor mode.
Write "K1" to start the operation selected by the operation mode setting buffer memory.
The setting of this buffer memory is effective for all channels.
BFM No.
CH1 CH2 CH3 CH4
#29
Caution
• When the PLC main unit is changed over from "RUN" to "STOP", outputs of the 4LC are held.
In order to stop outputs of the 4LC, make sure to use BFM#29.
• When the operation mode setting buffer memory is set to "0 (Not used)", the measured value (PV)
becomes "0".

8.2.10 [BFM#30] FX Series model code

The model code of the 4LC is stored.
BFM No.
CH1 CH2 CH3 CH4
#30
82
#24 Display range : 0 to 1050 (0.0 to 105.0A)
→ For details on the control mode switch, refer to Subsection 8.2.62.
→ For details on the control mode switch, refer to Subsection 8.2.62.
#28 Setting range : -32768 to +32767
→ For details on the operation mode, refer to Subsection 8.2.21.
0 : Stops control
1 : Starts control
The model code of the 4LC is K2090.
Description
Description
Description
Description
8 Buffer Memory
8.2 Buffer Memory Details
Initial
R/W Backup
value
- R -
Initial
R/W Backup
value
0 R/W -
Initial
R/W Backup
value
0 R/W -
Initial
R/W Backup
value
K2090 R -