Yokogawa Data Acquisition with PID Control CX2000 - Manual (Page 58)

1-46
IM 04L31A01-01E
Switching Conditions of Program Segments
The operating conditions related to the switching of the segments can be specified for
each segment. Such conditions include the condition for switching to the next segment
and the operating conditions within the segment. The following four conditions for
switching the segment are available.
• Switching for continuation (initial value)
• Hold-on switching
• Local-mode end
• Reset-mode end
Switching for Continuation
When the segment set to switching for continuation ends, the next segment is executed.
When switching for continuation is specified on the last segment, the program operation
is the same as when reset-end is specified. Below is an example of segment switching
for continuation.
PV
TIMEn
SEG.n SEG.n + 1
Time
n = 1 to 98
TIMEn + 1
Final SP of segment n
When SEG.n ends, the
operation continues
to the next segment
(SEG.n + 1).
Hold-on Switching
When a segment set to hold-on switching ends, the program operation is paused (hold
operation).
The hold condition continues until the hold operation mode is cleared through key
operation, external contact, or communication function. If the hold operation mode is
cleared at the last segment, the program operation is stopped (reset) and each control
loop enters the STOP status. In addition to releasing the hold mode, executing program
RUN operation or executing advance during hold operation also clears the hold mode.
Below is an example of segment hold-on switching.
PV
TIMEn
SEG.n
SEG.
n + 1
Time
n = 1 to 98
TIME
n + 1
In hold
The hold mode continues
until it is cleared.
When the segment (SEG.n) to which hold
switching has been assigned ends, the
program operation is paused (hold operation).
Local-Mode End
When the segment set to local-mode end is terminated, program control enters the stop
(reset) status, and each control loop operates in the local mode (constant SP). The SP
that is used varies depending on the ON/OFF condition of target setpoint tracking as
follows. In addition, when the operation enters local mode, PV event and time event are
turned OFF.
1.11 Program Control Related Settings