Bfm#55][Bfm#95][Bfm#135][Bfm#175] Manual Output Set Value; Bfm#56][Bfm#96][Bfm#136][Bfm#176] At (Auto Tuning) Execution Command - Mitsubishi Electric MELSEC FX Series User Manual

FX -4LC User's Manual
3U

8.2.19 [BFM#55][BFM#95][BFM#135][BFM#175] MANUAL output set value

To these buffer memories, set the output ON ratio in MANUAL mode.
Specify the ratio of the ON duration within the time (sec) specified by the control output cycle setting buffer
memories.
ON duration : Control output cycle (sec) × MANUAL output set value (%)
BFM No.
CH1 CH2 CH3 CH4
#55 #95 #135 #175 Setting range : -50 to +1050 (-5.0% to +105.0%)
*1. These buffer memories can be written only in MANUAL mode.
Example of operation
(When the control output cycle is 30 sec and the MANUAL output set value is 60%)
ON
Control output
OFF
Caution
• Handling numbers containing decimal places. The set value should be the actual value multiplied by 10.
• These buffer memories can be written only in MANUAL mode.
• Write these buffer memories after transfer to MANUAL mode is completed (that is, after b13 of the event
buffer memory turns ON).
• The actual output value is within the range from the output limiter lower limit to the output limiter upper limit.
• In AUTO mode, these buffer memories automatically store the control output value (MV).

8.2.20 [BFM#56][BFM#96][BFM#136][BFM#176] AT (auto tuning) execution command

These buffer memories stop or perform auto tuning.
Write "K0" to stop auto tuning.
Write "K1" to perform auto tuning.
BFM No.
CH1 CH2 CH3 CH4
#56 #96 #136 #176
Caution
• When performing auto tuning again, write "K0", wait for 0.5 sec or more, and then write "K1" again.
• Auto tuning can be performed in PID control and heating/cooling PID control.
• Auto tuning is not started if conditions for performing auto tuning are not satisfied.
→ For details on the conditions for performing AT (auto tuning), refer to Subsection 6.8.2.
→ For details on the control output cycle setting, refer to Subsection 8.2.34.
Description
18 sec. 12 sec.
60% 40%
Control output cycle
30 sec.
→ For details on the AT (auto tuning), refer to Section 6.8.
Description
0 : Stops AT (auto turning)
1 : Performs AT (auto turning)
→ For details on the event, refer to Subsection 8.2.2.
8 Buffer Memory
8.2 Buffer Memory Details
Initial
R/W Backup
value
*1
-50 -
R/W
Initial
R/W Backup
value
0 R/W
87
1
2
3
4
5
6
7
8
9
10