User`s manual

9 - 106 9 - 106
MELSEC-Q
9 CONTROL OPERATION INSTRUCTIONS
Processing contents
(1) Engineering value conversion
Engineering value conversion is performed with the following expression.
PV
n
E
n
RL
100
RH RL
(2) Input value 1 (E1) or input value 2 (E2) selection processing
Whether the input value 1 (E1) or input value 2 (E2) will be used is selected depending on the
e1 setting of the set value pattern (SVPTN).
• e1
0: Input value 1 (E1) is used PV PV
1
• e1 1: Input value 2 (E2) is used PV PV
2
SLN0: The bit corresponding to the input value 1 (E1) or input value 2 (E2) is turned to 1.
(3) Mode check
The following processing is performed depending on the operation mode (MODE) setting.
(a) When the operation mode (MODE) is any of MAN, CMB, CMV and LCM
1) "(5) Output conversion processing" is performed.
2) MHA, MLA and DMLA of the alarm detection (ALM) are turned to 0.
3) BB1 to BB4 of BB are turned to 0.
(b) When the operation mode (MODE) is any of AUT, CAB, CAS, CCB, CSV, LCA and LCC
1) Engineering value reverse conversion is performed with the following expression.
T (PV RL)
100
RH RL
2) "(4) Change rate, upper/lower limiter" is performed.
(4) Change rate, upper/lower limiter
Change rate and upper/lower limit value checks are performed on the input value 1 (E1) or
input value 2 (E2).
(a) Change rate limiter
Condition T’ BB4, DMLA
|T
MV
n
| DML T’ T0
(T MV
n
) DML T’ MV
n
DML 1
*1
(T MV
n
)
DML T’
MV
n
DML 1
*1
*1: When DMLI or ERRI in the alarm detection inhibition (INH) is set to 1, DMLA and BB4
show 0 since the alarm is inhibited.
(b) Upper/lower limiter
Condition MV BB2, MHA BB3, MLA
T’ MH MV
n
MH 1
*2
0
T’ ML MV
n
ML 0 1
*3
ML T’ MH MV
n
T’ 0 0
*2: When MHI or ERRI in the alarm detection inhibition (INH) is set to 1, MHA and BB2 show 0
since the alarm is inhibited.
*3: When MLI or ERRI in the alarm detection inhibition (INH) is set to 1, MLA and BB3 show 0
since the alarm is inhibited.