Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 289

■Public variable (operation constant)
• Operation processing
Variable Description
name
DVLS Large Deviation Alarm Hysteresis
PN Reverse Action/Direct Action
SVPTN_B0 Setting Value (SV) Used
RST_SDV_ON Reset DV Cumulative Value in Control Mode Change
_CHGMODE
■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
DVLA
occur
Condition
DVL < |DV|
|DV|  (DVL - DVLS)
DV: Deviation (%), DVLS: Large deviation alarm hysteresis (%), DVL: Deviation limit value (%)
Recommended range
0 to 100
0: Reverse action
1: Direct action
TRUE: Not used
FALSE: Used
TRUE: DV cumulative value (SDV)
reset at control mode change (from
MAN/CMV to AUT/CAS/CSV)
FALSE: DV cumulative value (SDV)
not reset
*1
Recommended range
TRUE, FALSE
DVLA DVLA DVLA
reset occur reset
10.18 Blend PI Control (Disable Tracking for primary loop) (M+P_BPI)
Initial
value
2.0
0
TRUE
FALSE
Initial
value
FALSE
DVLS
t
DVLS
Alarm (ALM)
Large deviation (DVLA)
TRUE (Detected)
FALSE (Reset)
10 LOOP CONTROL OPERATION
Set by Data type
User REAL
10
User INT
User BOOL
User BOOL
Set by Data type
User BOOL
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