Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 308

■Public variable (operation constant)
Variable Description
name
PN Reverse Action/Direct Action
SVPTN_B0 Setting Value (SV) Used
■Tag data
For details on tag data that is read or written with this tag access FB, refer to the following.
Page 530 ONF3
Processing details
■MV correction
This function block calculates a deviation (DV).
+
Deviation DV
(%)
0
-
MV 100%
Condition
Direct action (PN = 1)
Reverse action (PN = 0)
DV: Deviation (%), HSO: Hysteresis (%), MV: MV output
SV- Engineering range low limit
SV(%)=
Engineering range high limit-Engineering range low limit
PV- Engineering range low limit
PV(%)=
Engineering range high limit-Engineering range low limit
Hysteresis (%) is a percentage to (Engineering range high limit - Engineering range low limit).
■Three-position (on/off) control
This function block performs three-position (on/off) control in accordance with a manipulated value.
Condition
MV  75 (%)
25 (%)  MV < 75 (%)
MV < 25 (%)
MVB1, MVB2: Three-position (on/off) output, MV: MV output
• Set an integral multiple of the execution cycle (T) as a control cycle (CT).
10 LOOP CONTROL OPERATION
306
10.23 3 position ON/OFF Control (Disable Tracking for primary loop) (M+P_ONF3)
50% 0% 50%
×100
×100
Three-position (on/off) output
MVB1
TRUE
FALSE
FALSE
Recommended
range
0: Reverse action
1: Direct action
TRUE: Not used
FALSE: Used
Hysteresis HSO(%)
Hysteresis HSO(%)
Hysteresis HSO(%)
Hysteresis HSO(%)
100% 50%
Deviation (DV)
DV (%) = PV (%) - SV (%)
DV (%) = SV (%) - PV (%)
Initial value Set by
0 User
TRUE User
Hysteresis
HS1(%)
t
Hysteresis
HS1(%)
MVB2
FALSE
FALSE
TRUE
Data type
INT
BOOL