Siemens S7-200 - Page 113

Operating Your Text Display (TD) Device
5.5 Viewing the Screens and the Alarms
Text Display (TD) User Manual
System Manual, 08/2008, A5E00765548-03
113
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Figure 5-9 Displaying the Alarms
Tip
The TD 100C, TD 200C, and the TD400C allow you to configure a button specifically for
displaying alarms when you are creating your custom keypad.
The TD device displays the highest priority alarm. The TD device displays an up or down
arrow with the alarm to alert the operator that other alarms have been enabled. (The up
arrow shows that higher-priority alarms have been enabled, and the down arrow shows that
lower-priority alarms have been enabled.)
After reading a new alarm from the S7-200 CPU, the TD device sorts the alarms again to
display the highest priority alarms at the top of the list. The TD device determines the priority
based on the sequence of the alarms in the parameter block:
● The first alarm that you created has the highest priority.
● The second alarm that you created has the second-highest priority.
● The last alarm that you created has the lowest priority.
Tip
You can scroll up and down through the list of enabled alarms. However, the TD device
returns to the highest-priority alarm after a period of inactivity: If you have not pressed a
button for 10 seconds while the TD device has displayed the current alarm, then the TD
device automatically returns to the highest-priority alarm.
Acknowledging an Alarm
If an alarm requires acknowledgement, the TD device does not remove that alarm until you
acknowledge the alarm:
1. Use the UP or DOWN arrow to select the alarm.
2. Press ENTER to acknowledge the alarm.
Types of Alarms
The Text Display wizard allows you to determine the type interaction required by the
operator for an alarm. If the user screens are set as the default display mode for the TD
device and an alarm is enabled, an alarm indicator will begin to flash on the TD display. The
indicator is large if there is an alarm enabled that requires acknowledgement. The indicator
will be small if the alarms do not require acknowledgement. The user can switch to the alarm
display to view the alarms.
The alarm display will show one or more alarms in priority order. An UP or DOWN arrow in
the right-most character position indicates more alarms are active, but not visible on the
display. The operator can press either the UP or the DOWN arrow key to scroll through the
other enabled alarms.