Yokogawa Data Acquisition with PID Control CX2000 - Manual (Page 54)

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IM 04L31A01-01E
Program Pattern Number and Pattern Name
From the multiple program patterns available, you can switch the program pattern used
in the operation by specifying a number according to the conditions. Each program
pattern can be assigned a pattern name.
Program pattern number: 1 to 30 (1 to 4 on the /P1 option).
Pattern name: Up to 16 characters.
You cannot change the pattern number during program control. However, if contact
input is used to change the pattern number, the changes take effect when program
control ends.
With style number S3 or later, you can execute a program pattern while a separate
program pattern is executing if the operating loops do not overlap. You cannot change to
an executing program pattern and an overlapping pattern number of an operating loop.
However, when changing the pattern number by contact input, the changes take effect
from the point at which the program stops.
Number of Segments Used
The selectable number of segments is as follows:
• Number of segments that can be assigned to a single program: 1 to 99.
• Total number of segments constructing all program patterns: 300 max.
Segment Assignment Method
The following two types of segment assignment methods are available for selection.
• Segment time assignment method (factory default setting)
This method sets the action inside the segment using the final SP (control setpoint at
the end of the segment) and the segment time (time length from the start of the
segment to the end). Selectable range of final SP: Within the control measurement
span (within PV range span during loop control with PV switching).
Selectable range of segment time: 00:00:01 to 99:59:59.
Operation of
segment 1 to 99 Final SP
Time
PV
Final SP of the
previous segment
(Starting SP at the time
of program operation start)
Segment time
• Segment time ramp-rate assignment method
This method sets the action within the segment using the final SP and the ramp-rate
value. The ramp-rate value for ramp-up or ramp-down (SP change) is the amount of
change in the SP per 1 hour or 1 minute. The ramp-rate is common to all loops of
program control. Therefore, make the measurement span the same for all loops of
program control as much as possible. If the measurement span is not the same, the
ramp-rate is set using the smallest numbered loop of all loops of which program
control is ON. Based on this ramp-rate, the ramp-rates of other loops are set
proportional to the corresponding measurement spans.
The segment time during ramping is the maximum time in the specified loops. The
maximum time is 99:59:59. If this value is exceeded in the calculation, the control
moves to the next segment. Selectable range of ramp-rate during ramping is within
the control measurement span (within PV range span during loop control with PV
switching).
The segment time during soaking (the setpoint is constant) is the time length of the
segment.
Selectable range of segment time during soaking is 00:00:01 to 99:59:59.
1.11 Program Control Related Settings