Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 299

■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
■Loop stop processing
When the stop alarm (SPA) of the alarm (ALM) is TRUE, this function block performs the following processing.
• Outputs (MVP) are held.
• The control mode is automatically switched to MANUAL.
■Processing operation
: Performed, : Not performed
Control mode Processing operation
MV correction
MAN, CMV, AUT 

CAS, CSV
*1 Tracking is performed when the tracking flag (TRK) is 1.
Operation error
Error code Description
(SD0)
3400H An invalid operation (such as division by zero) is performed.
3402H Input data (PVP) or tag data is a subnormal number or NaN (not a number).
3403H An overflow has occurred.
3405H The control cycle (CT) setting is less than 0.
The execution cycle (T) setting is less than 0.
Hysteresis (HS0) is less than hysteresis (HS0) in negative.
The value divided the control cycle (CT) by the execution cycle (T) exceeds 32767.
Setting Value (SV) Used
(SVPTN_B0)
FALSE
TRUE
FALSE or TRUE
Two-position (on/
off) control


10.20 2 position ON/OFF Control (Enable Tracking for primary loop) (M+P_ONF2_T)
Result
The input variable CASIN_T is tracked.
The input variable CASIN_T is not tracked.
Engineering value Inverse
conversion engineering value
conversion
 
 
10 LOOP CONTROL OPERATION
10
Tracking
*1


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