Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 298

■Public variable (operation constant)
Variable Description
name
PN Reverse Action/Direct Action
TRK Tracking Flag
SVPTN_B0 Setting Value (SV) Used
SVPTN_B1 Setting Value (SV) Pattern
*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 527 ONF2
Processing details
■MV correction
This function block calculates a deviation (DV).
Deviation DV
(%)
+
0
-
MV 100% 0%
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).
■Two-position (on/off) control
This function block performs two-position (on/off) control in accordance with a manipulated value.
Condition
|MV|  50 (%)
|MV| < 50 (%)
MVB: Two-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
296
10.20 2 position ON/OFF Control (Enable Tracking for primary loop) (M+P_ONF2_T)
*1
100% 0%
Recommended range
0: Reverse action
1: Direct action
0: Not executed
1: Executed
TRUE: Not used
FALSE: Used
TRUE: Not primary MV
FALSE: Primary MV
Hysteresis HSO(%)
Hysteresis HSO(%)
100%
Deviation (DV)
DV (%) = PV (%) - SV (%)
DV (%) = SV (%) - PV (%)
×100
×100
Two-position (on/off) output (MVB)
TRUE
FALSE
Initial value Set by
0 User
0 User
TRUE User
TRUE User
t
Data type
INT
INT
BOOL
BOOL