DCP200 Profile Controller & Recorder - Product Manual

Table 28. Examples Of Logical Alarm Outputs

Logical OR: Alarm 1 OR Alarm 2

 

 

 

Direct Acting

 

 

 

 

Reverse-Acting

 

 

 

 

ALARM1

OFF

ALARM2

OFF

OUTPUT

OFF

ALARM1

OFF

 

ALARM2

OFF

 

OUTPUT

ON

 

 

ON

OFF

ON

ON

 

OFF

 

OFF

 

 

 

 

 

 

 

 

 

 

 

 

 

OFF

 

ON

 

ON

 

OFF

 

 

ON

 

 

OFF

 

 

 

ON

 

ON

 

ON

 

ON

 

 

ON

 

 

OFF

 

Logical AND: Alarm 1 AND Alarm 2

 

 

Direct Acting

 

 

 

 

Reverse-Acting

 

 

 

ALARM1

OFF

ALARM2

OFF

OUTPUT

OFF

ALARM1

OFF

 

ALARM2

OFF

 

OUTPUT

ON

 

ON

OFF

OFF

ON

 

OFF

 

ON

 

 

 

 

 

 

 

 

 

 

 

OFF

 

ON

 

OFF

 

OFF

 

 

ON

 

 

ON

 

 

ON

 

ON

 

ON

 

ON

 

 

ON

 

 

OFF

 

Loop Alarm

A loop alarm detects faults in the control feedback loop, by continuously monitoring process variable response to the control output(s). If one of the 5 alarms is defined to be a loop alarm, it repeatedly checks if the PID control output is at saturation. If saturation is reached (0% or 100% power for single control type, -100% or +100% for dual control type), an internal timer is started. Thereafter, if the output has not caused the process variable to be corrected by a predetermined amount 'V' after time 'T' has elapsed, the alarm becomes active. Subsequently, the alarm repeatedly checks the process variable and the PID output. When the process variable starts to change value in the correct sense or when the PID output is no longer at the limit, the alarm is deactivated.

For PID control, the loop alarm time 'T' can be automatic (twice the Integral Time value) or set to a user defined value. Correct operation with the automatic loop alarm time depends upon reasonably accurate PID tuning. The user defined value is always used for On-Off control, and the timer starts as soon as an output turns on.

The value of 'V' is dependent upon the input type. For Temperature inputs, V = 2°C or 3°F. For Linear inputs, V = 10 x LSD

The loop alarm is automatically disabled during manual control mode and during execution of a Pre-Tune. Upon exit from manual mode or after completion of the Pre-Tune routine, the loop alarm is automatically re-enabled.

Also refer to: Alarm Types, Control Type, Manual Loop Alarm Time, Linear Input, LSD, Manual Mode, On-Off Control, PID, Pre-Tune, Process Variable and Tuning.

LSD

The Least Significant Digit (LSD) is the smallest incremental value that can be shown at the defined display resolution.

Also refer to: Display Resolution.

mADC

This stands for milliamp DC. It is used in reference to the linear DC milliamp input ranges and the linear DC milliamp outputs. Typically, these will be 0 to 20mA or 4 to 20mA.

Also refer to: Input Range, Linear Input, Linear Output,, mVDC, Process Variable and VDC

51-52-25-150, Issue 1 – April 2009

Glossary

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Honeywell DCP200 manual Logical or Alarm 1 or Alarm, Logical and Alarm 1 and Alarm, Loop Alarm, Madc

DCP200 specifications

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