Exceed Condition; Limit Output Function; Limit Annunciator Outputs; -Din, 1 / 8 -Din & 1 / 16 - Din Controllers & Indicators - Product Manual - WEST P8700 User Manual

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Exceed Condition

An Exceed Condition occurs when the Process Variable exceeds the Limit Setpoint value
(i.e. PV is greater than the Limit Setpoint when set for high limit action, PV is less than the
Limit Setpoint for low limit action). The
extinguished once it has passed.

Limit Output Function

The Limit Output relay(s) de-energise whenever an Exceed condition occurs, causing the
process to shut down. The
The relay remains latched off even if the Exceed condition is no longer present. A reset
instruction must be given after the exceed condition has passed to re-energise the relay,
allowing the process to continue. The

Limit Annunciator Outputs

An Annunciator output will activate when an Exceed condition occurs, and will remain active
until a reset instruction is received, or the Exceed condition has passed. Unlike the Limit
Output, an Annunciator can be reset even if the Exceed condition is present. When an
Annunciator is active, the
Resetting Limit Outputs & Annunciators
A reset instruction can be given by any of the following methods. The front panel Reset key,
the Digital Input (if fitted) or via Serial Communications command if an RS485
Communications module is fitted.
Using The Reset Key To Reset Limit Outputs & Annunciators
Press the
Note:
Annunciators will deactivate immediately, Limit Outputs will only re-energise if the Exceed
condition has passed.
CAUTION:
Ensure that the cause of the Exceed condition has been rectified before resetting
the Limit Output.

Resetting Limit Hold and Exceed Time

The highest PV value reached (for High Limit action) or lowest PV value reached (for Low
Limit action) and the accumulated time of Limit SP exceed conditions can be viewed.

To reset the stored Limit Hold and Exceed Time values

Display the value to be reset, the press the
briefly shows 8888 when the value is reset.
59305, Issue 5 – March 2005
- DIN Controllers & Indicators - Product Manual
LED is on when the relay is de-energised.
LED will flash and the Alarm Status screen is available.
key reset an active Annunciator or latched Limit Relay.
LED is on during this condition, and is
LED then turns off.
key for 5 seconds. The upper display
P6700, P8700 & P4700 Model Group Page 65