Справочник Пользователя для Mitsubishi Electronics FX2NC
FX Series Programmable Controllers
Points Of Technique 10
10-26
10.16
Additional PID functions
The following parameter table gives the additional parameters available with FX
2N(C)
MPUs.
These are:
-
S
3
+1 bit 4: Pre-tuning operation flag.
-
S
3
+1 bit 5: Output Value range limit flag.
-
S
3
+22: Output Value upper limit.
-
S
3
+23: Output Value lower limit.
For the full list of other parameters refer to page 5-102.
Note: S
3
+1 b2 and b5 should not be active at the same time. Only one value each is entered
into the data registers S3+22 and S3+23.
10.16.1 Output Value range control (S
3
+1 b5)
Bit 5 of parameter S
3
+1, when ON, activates S
3
+22 and S
3
+23 to be upper and lower limits for
the output value (MV).
This feature restricts the output value to the specified limits; in effect, this automatically
performs the same operation as that described in section 10.15.1.
This feature restricts the output value to the specified limits; in effect, this automatically
performs the same operation as that described in section 10.15.1.
Param-
eter
S
3
+
P
Parameter
name/func-
tion
Description
Setting
range
S
3
+1
Action-reac-
tion
direction and
alarm control
tion
direction and
alarm control
b0
Forward operation(0),
Reverse operation (1)
Reverse operation (1)
Not
applicable
b1
Process Value (S
2
) change alarm OFF(0)/ON(1)
b2
Output Value (MV) change alarm OFF(0)/ON(1)
b3
Reserved
b4
Activate pre-tuning (auto resets on completion)
b5
Output Value (MV) range limit OFF(0)/ON(1)
b6-15
Reserved
S
3
+22
Output Value,
maximum
positive
change alarm
maximum
positive
change alarm
Active
when
S
when
S
3
+1, b2
is set ON.
This is an alarm for the quantity of positive change
which can occur in one PID scan. If the Output
Value (MV) exceeds this value, bit S
which can occur in one PID scan. If the Output
Value (MV) exceeds this value, bit S
3
+24, b2 is
set
0 to 32767
Output Value,
Upper limit
restriction
Upper limit
restriction
Active
when
S
when
S
3
+1, b5
is set ON.
This is an upper limit for the Output Value (MV).
During operation the PID instruction restricts the
output so that it does not exceed this limit.
During operation the PID instruction restricts the
output so that it does not exceed this limit.
-32768 to
32767
S
3
+23
Output Value,
maximum
negative
change alarm
maximum
negative
change alarm
Active
when
S
when
S
3
+1, b2
is set ON.
This is an alarm for the quantity of negative
change which can occur in one PID scan. If the
Output Value (MV) falls below this value, bit
S
change which can occur in one PID scan. If the
Output Value (MV) falls below this value, bit
S
3
+24, b3 is set.
0 to 32767
Output Value,
Lower limit
restriction
Lower limit
restriction
Active
when
S
when
S
3
+1, b5
is set ON.
This is a lower limit for the Output
Value (MV).
During operation, the PID instruction restricts the
output so that it does not fall below this limit.
Value (MV).
During operation, the PID instruction restricts the
output so that it does not fall below this limit.
-32768 to
32767
FX
0(S)
FX
0N
FX FX
(2C)
FX
2N(C)