Bfm#242, #243] Sv Tracking Selection - Mitsubishi Electric MELSEC FX Series User Manual

FX -4LC User's Manual
3U

8.2.63 [BFM#242, #243] SV tracking selection

The SV tracking selection function makes the slave channel set value (SV) track the set value (value stored in
the set value monitor buffer memory) just before changeover to cascade OFF when the cascade control
function is changed from ON to OFF.
Write "K0" to disable the tracking function.
Write "K1" to enable the tracking function.
Control group 1 (GR1) : The setting is applied to CH1 and CH2.
Control group 2 (GR2) : The setting is applied to CH3 and CH4.
BFM No.
CH1 CH2 CH3 CH4
GR1 GR2
#242 #243
*1. 0 in the case of heating/cooling PID control.
*2. These buffer memories can be written only while standard PID control is being performed.
Example of operation 1 (When SV tracking is provided)
Set value (SV) of slave
channel
Example of operation 2 (When SV tracking is not provided)
Set value (SV) of slave
channel
Point
This function prevents drastic change in the set value (SV) caused when the cascade control function is
changed from ON to OFF.
→ For details on the cascade control, refer to Section 6.7.
→ For details on the set value monitor, refer to Subsection 8.2.13.
→ For details on the set value (SV), refer to Subsection 8.2.15.
Description
Setting range :
• PID control :
0 : Disable
1 : Enable
• Heating/cooling PID control :
0 (Not used)
Cascade control
ON -> OFF changeover point
Cascade control
ON -> OFF changeover point
Value stored in set
value monitor buffer
memory for slave
channel
Time
Value stored in set
value monitor buffer
memory for slave
channel
Time
8 Buffer Memory
8.2 Buffer Memory Details
Initial
R/W Backup
value
*1 *2
-
1 R/W
119
1
2
3
4
5
6
7
8
9
10