Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 262

■Public variable (operation constant)
Variable Description
name
DVLS Large Deviation Alarm Hysteresis
PN Reverse Action/Direct Action
TRK Tracking Flag
SVPTN_B Setting Value (SV) Used
0
SVPTN_B Setting Value (SV) Pattern
1
*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.
■Tag data
For details on tag data that is read or written with this tag access FB, refer to the following.
Page 511 SPI
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
260
10.13 Sample PI Control (Enable Tracking for primary loop) (M+P_SPI_T)
*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
DVLS
t
DVLS
DVLA
reset
Alarm (ALM)
Large deviation (DVLA)
TRUE (Detected)
FALSE (Reset)
Initial value Set by
2.0 User
0 User
0 User
TRUE User
TRUE User
Data type
REAL
INT
INT
BOOL
BOOL