Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 182

■Public variable (operation constant)
Variable Description
name
DVLS Large Deviation Alarm Hysteresis
PN Reverse action and direct action
SVPTN_B0 Setting Value (SV) Used
SVLMT_EN SV High/Low Limiter
*1 When SVPTN_B0 is TRUE, CASIN inputs cannot be used even though the mode is changed to the CAS mode.
■Tag data
For details on tag data that is read or written with this tag access FB, refer to the following.
Page 535 SWM
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 (%)
• Deviation (DV) for direct/reverse action is calculated as follows.
Condition
Direct action (PN = 1)
Reverse action (PN = 0)
DV: Deviation (%)
PVP (%): PV input value (%)
100
SVC(%)= ×(SVC-RL)
RH-RL
RH: Engineering value high limit
RL: Engineering value low limit
SVC: Setting value (current)
■Engineering value conversion
This function block converts the setting value (%) from the primary loop in the CAS or CSV mode into an engineering value.
SV = (RH - RL)/100  Setting value (%) from primary loop + RL
RH: Engineering value high limit, RL: Engineering value low limit, SV: Setting value
9 I/O CONTROL
180
9.9 Manual Setter (M+P_MSET_)
*1
DVLA DVLA DVLA
occur reset occur
Recommended
range
0 to 100
0: Reverse action
1: Direct action
TRUE: Not used
FALSE: Used
TRUE: Execute
FALSE: Not execute
DVLS
t
DVLS
DVLA
reset
Alarm (ALM)
Large deviation (DVLA)
TRUE (Detected)
FALSE (Reset)
Deviation (DV)
DV (%) = PVP (%) - SVC (%)
DV (%) = SVC (%) - PVP (%)
Initial value Set by
2.0 User
0 User
TRUE User
FALSE User
Data type
REAL
INT
BOOL
BOOL