Bfm#244, #245] Cascade On/Off; Bfm#246, #247] Cascade Gain - Mitsubishi Electric MELSEC FX Series User Manual

FX -4LC User's Manual
3U

8.2.64 [BFM#244, #245] Cascade ON/OFF

Using these buffer memories, turn ON or OFF cascade control.
Write "K0" to turn OFF cascade control.
Write "K1" to turn ON cascade control.
When cascade control is changed over from OFF to ON, the control output from the master channel is
changed over without bump. When cascade control is changed over from ON to OFF, the resulted operation
varies depending on the setting of the SV tracking selection buffer memory.
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
#244 #245
*1. These buffer memories can be written only while standard PID control is being performed.
Caution
• Cascade control is disabled when heating/cooling PID control is selected.
• Auto tuning and startup tuning are disabled while cascade control is being performed.

8.2.65 [BFM#246, #247] Cascade gain

To these buffer memories, set the gain used during cascade control when the control output (MV) from the
master channel is added to the cascade bias, converted into the full scale of the slave channel input range,
and then converted into the cascade signal.
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
#246 #247
*1. These buffer memories can be written only while standard PID control is being performed.
*2. 0 in the case of heating/cooling PID control.
Caution
Handling numbers containing decimal places. The set value should be the actual value multiplied by 1000.
120
→ For details on the SV tracking selection, refer to Subsection 8.2.64.
Description
Setting range :
• PID control :
0 : Cascade OFF
1 : Cascade ON
• Heating/cooling PID control :
0 (Not used)
→ For details on the cascade bias, refer to Subsection 8.2.66.
Description
Setting range :
• PID control :
-10000 to +10000 (-10.000 to +10.000 times)
• Heating/cooling PID control :
0 (Not used)
→ For details on the cascade control, refer to Section 6.7.
→ For details on the cascade control, refer to Section 6.7.
8 Buffer Memory
8.2 Buffer Memory Details
Initial
R/W Backup
value
*1
0 -
R/W
Initial
R/W Backup
value
*2 *1
1000 R/W