Yokogawa Data Acquisition with PID Control CX2000 - Manual (Page 258)

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IM 04L31A01-17E
9
Green Series Communications
9.9 Operations That You Can Carry Out during
Control Operation
During control operation, you can show the control status of the connecting models as
external loops on the control group display. In addition, you can carry out operations
related to control on the control group display in the same fashion as internal loops.
Operations on the Control Group Display
You can carry out the following operations on the control group display or the control
overview display in the same fashion as internal loops. The operating procedure is
the same as for internal loops. For details, see section 6.1, “Operations on the
Control Group Display” in the user’s manual IM 04L31A01-01E or IM 04L31A01-03E.
• Run/Stop the operation.
• Switch between auto, manual, and cascade control.
• Change the target setpoint.
• Change the control output.
• Switch between remote and local.
• Switch between tuning display and program control display.
Operations on the Tuning Display and Program Control Display
Tuning operations can be performed by switching from the control group display to the
tuning display or program control display. For details, see section 6.3, “Tuning
Operation” in the user’s manual IM 04L31A01-01E or IM 04L31A01-03E.
Operation on the Tuning Display
• Auto tuning
• Manual tuning
• Change the target setpoint number and the PID number of the tuning parameter to
be manipulated
• Run/Stop the operation
• Switch between auto and manual operation
• Change the control output
• Switch between remote and local
Alarm Indication
The following table shows the alarm indications on the display according to the alarm
types.
Alarm Type 1-Character Indication 3-Character Indication
PV high-limit alarm (energize/nonhold) H PVH
PV low-limit alarm (energize/nonhold) L PVL
Deviation high-limit alarm (energize/nonhold) D DVH
Deviation low-limit alarm (energize/nonhold) d DVL
Deviation high-limit alarm (deenergize/nonhold) D DVH
Deviation low-limit alarm (deenergize/nonhold) d DVL
Deviation high & low limit alarm (energize/nonhold) I DVO
Deviation within high & low limits alarm i DVI
(energize/nonhold)
PV high-limit alarm (deenergize/nonhold) H PVH
PV low-limit alarm (deenergize/nonhold) L PVL
PV high-limit alarm (energize/hold) H PVH
PV low-limit alarm (energize/hold) L PVL
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