Yokogawa Data Acquisition with PID Control CX2000 - Manual (Page 57)

1-45
IM 04L31A01-01E
Explanation of Functions
3
2
1
4
5
6
7
8
9
10
11
12
13
14
• Example in which the segment consists of only an up ramp
When set to ramp-prioritized PV1 start, the ramp-rate of the 1 st loop is prioritized. The
program operation start point of the 1 st loop will be one of the points from B1 to E1
(depends on the PV position a to e at that point. If the PV position is at point a,
program operation will not start). The program operation start point of the 2
nd loop
(one of the other loops) must be at the same time as that of the 1 st loop. For example,
if the program operation start point of the 1 st loop is point B1, the program operation
start point of the 2 nd loop is point B2.
PV
SEG1
A2
B2
D2 E1
B1
C2
A1
C1
E2
D1
SEG2
Time
a
b
c
d
e
Program pattern for
the 1st loop
Program pattern for
the 2nd loop
Time-prioritized PV Start
Program operation is started by prioritizing the segment time to change the SP from the
PV at the start of program operation to the final SP of the 1
st segment. The ten-segment
linearizer ramp is defined by “(final SP – PV)/segment time.” When the 1 st segment is a
soak segment, the start condition is the same as with the starting target setpoint start.
• Example in which the 2
nd segment is a soak segment
The program operation start point of the 1 st loop is always one of the points from point a
to e. Since the program operation start point of the 2 nd loop is at the same time as that
of the 1 st loop, the program operation start point is one of the points point a2 to e2.
PV
SEG1
TSP1
TSP2
TSPn: Final SP
C2
C1
SEG2 SEG3 SEG4 SEG5
Time
C1
C1
C1
C1
Program pattern for
the 2nd loop
Program pattern for
the 1st loop
a
b
c
d
e
a2
b2
c2
d2
e2
Note
This start method cannot be selected if the segment setting method is set to segment time
ramp grade.
1.11 Program Control Related Settings