Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 235

■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-RL)
SV(%)=
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
■Variation rate & high/low limiter
This function block checks the variation rate and high/low limits of the input value.
• Variation rate limiter
Variation rate limiter processing result
DML
DML
Execution cycle (ΔT)
Control cycle (CT)
Condition
|T - MV|  DML
T - MV > DML
T - MV < -DML
T: Tentative manipulated value, MV: Manipulated value, DML: Output variation rate high limit value
• High/low limiter
High/low limiter processing result
Execution cycle (ΔT)
Control cycle (CT)
Condition
Variation rate limiter processing result
> MH
Variation rate limiter processing result
< ML
ML  Variation rate limiter processing
result  MH
MH: Output high limit value, ML: Output low limit value
10.9 Position Type PID Control (Enable Tracking for primary loop/Disable Tracking from secondary loop) (M+P_PIDP_T)
Setting Value (SV) Used (SVPTN_B0)
FALSE
TRUE
FALSE or TRUE
Tentative MV value (T)
DML
DML
Control cycle (CT)
Variation rate limiter processing result
T
MV + DML
MV - DML
Variation rate limiter processing value
Control cycle (CT)
High/low limiter processing
result
MH
ML
Variation rate limiter processing value
Result
The input variable CASIN_T is tracked.
The input variable CASIN_T is not tracked.
Variation rate limiter
processing value
DML
DML
DML
Control cycle (CT)
Alarm (ALM)
Output variation rate limit (DMLA)
FALSE (Reset)
TRUE (Detected)
TRUE (Detected)
High/low limiter
processing value
t
Control cycle (CT)
Alarm (ALM)
Output Low Limit Alarm (MLA)
FALSE (Reset)
TRUE (Detected)
FALSE (Reset)
10 LOOP CONTROL OPERATION
t
Output high limit
(MH)
Output low limit
(ML)
Output High Limit Alarm
(MHA)
TRUE (Detected)
FALSE (Reset)
FALSE (Reset)
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