Yokogawa Data Acquisition with PID Control CX2000 - Manual (Page 232)

6-7
IM 04L31A01-01E
Operations during Control Operation
6
Display and Operation on the Control Display and Control Mode
For internal loops, the information that is displayed in the control data display section
(“Dsp.” in the following table) and the possible switching/setting operations (“Opr.” in the
following table) vary depending on the control mode as shown in the following figure.
For a description on the “control mode and switching operation” of external loops through
the optional Green series communications, see the DAQSTATION CX1000/CX2000
Communication Interface User’s Manual
.
MODE: Auto (AUT), manual (MAN), or cascade (CAS)
REM/LOC: Remote or local (PRG/LOC: Program or local* 3 )
RUN/STP: Operation running (RUN) or operation stopped (STP)
SP: Target setpoint
OUT: Control output
Dsp.
Yes
Yes* 2
Yes
Yes
Opr.
Yes
No
Yes
Yes
Opr.
Yes* 1
Yes* 1
No
Yes* 1
Control Mode
Operation Status/
Switching
Single loop
Cascade
PV switching
Primary
Secondary
Dsp.
Yes
Yes
No
Yes
Dsp.
Yes
No
Yes
Yes
Opr.
Yes
No
Yes
Yes
Dsp.
Yes
Yes
Yes
Yes
Opr.
Yes
Yes
Yes
Yes
Dsp.
Yes
Yes
Yes
Yes
Opr.
Yes
No
Yes
Yes
MODE REM/LOC* 3 RUN/STP SP OUT
*1 Not displayed on the soft key menu if [Remote setting] and [Program control] are set to
[Off].
*2 Fixed to auto (AUT).
*3 “PRG/LOC” when [Program control] is [On].
In addition, the following table shows the conditions in which the soft key menu for
switching/setting appears, but operation is not possible.
Switching/Setting Operation Condition in Which Operation Corrective Action
Is Not Possible
Switching to [CAS] using When “A/D error”, “burnout error”, Resolve the cause of error on
[MODE] or “Computation Error”* occurs at on the primary loop
the PV input or remote input of
cascade control the primary side
Switching to [REM] using When “A/D error”, “burnout error”, Resolve the cause of error at
[REM/LOC] or “Compuration Error”* the occurs at the remote input.
remote input
Switching to [PRG] using When program control is in Switch to [RUN] of program
[PRG/LOC] reset mode control
Changing [SP] During auto tuning, remote mode, Stop auto tuning, switch to
program mode, or cascade control local mode, or switch to auto/
(when [MODE]of the secondary manual operation
loop is [CAS])
Changing [OUT] When the operation is stopped or Switch to manual operation
when operation mode is not
manual ([MODE] is not [MAN])
* When the computation of the loop specified in PV/SP computed results in an error.
• Error messages for the operations above
Switching to [CAS] using [MODE]: Cascade mode cannot be selected.
Switching to [REM] using [REM/LOC]: Remote mode cannot be selected.
Switching to [PRG] using [PRG/LOC]: Program mode cannot be selected.
Changing [SP] or [OUT]:
Can not operate in the present situation.
6.1 Operations on the Control Group Display (Switching Displayed Information and Control Operation Modes)