8.6
Forcing Points On and Off
Forcing control points ON and OFF allows a precise degree of manual system control. For example, you can force a relay or signal point ON
to test or execute its function. Unlike ENABLE/DISABLE (see description in previous section), a point that you force OFF does not refresh its
state when the point is turned back ON.
Example:
Suppose you turn a signal point OFF, and during the time the point is disabled, a custom control equation executes that turns
the point ON. When the point is subsequently returned to automatic operation, the point's state does not update and the custom control
equation turning the point ON does not execute.
Follow these steps to force a point ON or OFF.
1.
Select the point. Refer to
Selecting Points for Status and Control
for information on selecting points.
2.
Press the “Select Item” softkey or press ENTER to access the point.
3.
Scroll down to show the various softkey operations.
4.
Press either the “On” or “Off” softkey.
The system indicates that the command has been accepted and generates a "Manual Override Trouble" for the point to remind you that
the point has been forced ON or OFF.
8.6.1 Returning a Point to Automatic Operation
Automatic operation is the normal operation of the point. For example, if the point is a signal point, a setting of AUTOMATIC indicates that
the signal is under the control of the job executing on the panel.
To return the state of a point that is currently ON or OFF to AUTOMATIC, follow these steps.
1.
Select the point. Refer to
Selecting Points for Status and Control
for information on selecting points.
2.
Press the “Select Item” softkey or press ENTER to access the point.
3.
Scroll down to show the various softkey operations.
4.
Press the “Automatic” softkey.
The system clears the "Manual Override Trouble."
8.7
Displaying and Clearing Historical Logs
Historical logs provide a record of both the events that have occurred on the system and the actions taken by an operator to manage
those events. The system contains the following logs:
•
Historical Alarm Log
. Provides detailed information on each alarm, including time and date stamp, that has occurred since the last
time the logs were cleared.
•
Historical Trouble Log
. Provides detailed information on each trouble, including time and date stamp, that has occurred since the
last time the logs were cleared.
1.
Press the MENU key. Use the NEXT and PREVIOUS keys to scroll through the choices until the "DISPLAY HISTORICAL ALARM LOG"
or "DISPLAY HISTORICAL TROUBLE LOG" choice is displayed.
2.
Press ENTER to access the log file.
3.
Use the NEXT and PREVIOUS keys to scroll through the entries in the selected log.
page 26
579-685 Rev. D
InfoAlarm Operator’s Manual 4100U, 4100ES, 4010ES
