Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 265

■Engineering value conversion
This function block converts the setting value (%) from the primary loop in the CAS or CSV mode into an engineering value.
RH-RL
×
SV= Setting value (%) from the primary loop + RL
100
RH: Engineering value high limit, RL: Engineering value low limit, SV: Setting value
■Inverse engineering value conversion
This function block converts the setting value (SV) of an engineering value into a setting value (SV) in percentage (%).
100
SV(%)= ×(SV-RL)
RH-RL
RH: Engineering value high limit, RL: Engineering value low limit, SV: Setting value
■Tracking processing
The following table shows whether tracking processing to the input variable CASIN_T is performed or not.
Condition
Tracking Flag (TRK)
1
0
■Disable alarm detection
This function block sets whether to detect alarms (ALM) or not in the deviation check.
Item
Disable alarm detection by setting tag data
Disable alarm detection by loop stop processing
■Loop stop processing
When the stop alarm (SPA) of the alarm (ALM) is TRUE, this function block performs the following processing.
• MV is cleared to 0.
• The control mode is automatically switched to MANUAL.
• When DVLA of the alarm (ALM) has occurred, the DVLA is reset.
• No alarm is detected in the deviation check.
■Processing operation
: Performed, : Not performed
Control mode Processing operation
Deviation check

MAN, CMV, AUT

CAS, CSV
*1 Tracking is performed when the tracking flag (TRK) is 1.
*2 An alarm whose corresponding bit is TRUE (Valid) in the disable alarm detection (INH) is not detected.
Setting Value (SV) Used (SVPTN_B0)
FALSE
TRUE
FALSE or TRUE
Disable alarm detection processing
If the following bits in the disable alarm detection (INH) are TRUE, no DVLA of
the alarm (ALM) will be detected.
• ERRI
• DVLI
Page 263 Loop stop processing
SPI operation Engineering
value
conversion
 
 
10.13 Sample PI Control (Enable Tracking for primary loop) (M+P_SPI_T)
Result
The input variable CASIN_T is tracked.
The input variable CASIN_T is not tracked.
Inverse Tracking
engineering
value
conversion
*1
 
 
10 LOOP CONTROL OPERATION
10
Alarm
*2

*2

263