Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 284

■Public variable (operation constant)
Variable Description
name
DVLS Large Deviation Alarm Hysteresis
PN Reverse Action/Direct Action
TRK Tracking Flag
SVPTN_B0 Setting Value (SV) Used
SVPTN_B1 Setting Value (SV) Pattern
RST_SDV_ON Reset DV Cumulative Value in Control Mode Change
_CHGMODE
*1 When 1 (tracking is executed) is set to the tracking flag, connect CASOUT_T of the primary loop with the input variable CASIN_T.
■Public variable (others)
Variable Description
name
RST_SDV Reset DV Cumulative Value
FALSE  TRUE: DV cumulative value (SDV) reset
*1 Read or write the variables using a program. They are not displayed in "FB Property" of the engineering tool.
■Tag data
For details on tag data that is read or written with this tag access FB, refer to the following.
Page 519 BPI
Processing details
■Deviation check
This function block performs deviation check processing.
DVL
0
-DVL
Condition
DVL < |DV|
|DV|  (DVL - DVLS)
DV: Deviation (%), DVLS: Large deviation alarm hysteresis (%), DVL: Deviation limit value (%)
10 LOOP CONTROL OPERATION
282
10.17 Blend PI Control (Enable Tracking for primary loop) (M+P_BPI_T)
*1
*1
DVLA DVLA DVLA
occur reset occur
Recommended range
0 to 100
0: Reverse action
1: Direct action
0: Not executed
1: Executed
TRUE: Not used
FALSE: Used
TRUE: Not primary MV
FALSE: Primary MV
TRUE: DV cumulative value (SDV)
reset at control mode change (from
MAN/CMV to AUT/CAS/CSV)
FALSE: DV cumulative value (SDV)
not reset
Recommended range
TRUE, FALSE
DVLS
t
DVLS
DVLA
reset
Alarm (ALM)
Large deviation (DVLA)
TRUE (Detected)
FALSE (Reset)
Initial Set by Data type
value
2.0 User REAL
0 User INT
0 User INT
TRUE User BOOL
TRUE User BOOL
FALSE User BOOL
Initial Set by Data type
value
FALSE User BOOL