Yokogawa Data Acquisition with PID Control CX2000 - Manual (Page 184)

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IM 04L31A01-01E
• Ramp-rate time unit
Set the unit of time when setting a ramp grade per unit time to [Hour], [Minute], or
[Second].
• SP ramp-down-rate/SP ramp-up-rate
Set this item to [On] (initial setting is Off) to decrease or increase the setpoint at a
constant rate of change, as opposed to a rapid change, when the SP is changed.
When set to [On], set the value that is to change per ramp-rate-time unit in the range
of “1 digit to EUS of measurement span (100%).”
• Tag/Tag comment
Set the tag name or tag comment of each control loop using up to 8 alphanumeric
characters.
Setting Parameters Related to Zone PID
These settings are possible only when [Zone PID] under [Control] > [#1 Control action,
Input setting] is set to [On].
• Loop number
The setup items of zone PID method are set for each loop. When changing these
parameters, this setting is used to select the target loop number [1] to [6] (initial value
is 1). The loop number is displayed up to the number of loops you specified at the
time of purchase.
• Reference point
Set the reference points for the zone PID method.
The number of reference points that can be specified is “PID group number – 2.”
Reference points can only be specified when [PID number] is set to [3] or higher. For
a description on the settings of the number of PID groups, see section 4.1, “Control >
Control action, Input setting.”
The selectable range of reference point values is shown using “EU (0.0 to 100.0%) of
the measurement span) in a pop-up window. Reference points set up to 100% are
valid. Set the reference points so that 1 ≤ 2 ≤ 3 ≤ 4 ≤ 5 ≤ 6.
• Switching hysteresis
Set the hysteresis used for switching zones at the reference points and deviation in
the range of “EUS (0.0 to 10.0%) of the measurement span” (initial value is 0.5%).
Can be specified when the [PID number] is set to 2 or greater.
• Reference deviation
Set this value to [On] (initial value is Off) when selecting the PID value according to
the deviation from the SP (program setpoint). When set to [On], set the deviation in
the range of 1 digit to EUS (100.0%) of the measurement span.
Can be specified when the [PID number] is set to 2 or greater.
4.8 Operation-related parameters/Zone PID