Siemens S7-200 - Page 103

Operating Your Text Display (TD) Device
5.2 Using the Text Display Device to Access Screens and Alarms
Text Display (TD) User Manual
System Manual, 08/2008, A5E00765548-03
103
● Arrow buttons:
– UP arrow scrolls (upwards) through menu items or increments a value that can be
edited.
– DOWN arrow scrolls (downwards) through menu items or decrements a value that can
be edited.
– LEFT and RIGHT arrows move the cursor left or right within the message (TD 100C,
TD 200C, and TD400C only). For a TD 200, use SHIFT+DOWN to move right and
SHIFT+UP to move left. You can also use ENTER to move to the next variable
message.
To select a menu item, use the UP and DOWN arrows to scroll through the list of available
items. The TD device highlights the menu item.
● Pressing ENTER selects the highlighted item.
● Pressing ESC returns to the previous menu or screen.
Display Backlight on the TD400C
The TD400C allows you to set the amount of time that the display backlight is on. This allows
you to extend the life of theTD400C by turning off the backlight when the display is not
needed.
You can configure the TD400C display backlight on time:
● From 1 to 59 minutes in 1 minute increments
● Always on
● 1, 2, 4, or 8 hours
● Default on time (10 minutes)
The backlight will turn on when:
● The TD400C is powered on
● The S7-200 CPU forces a reset of the TD400C with the TD_Reset bit in the TD parameter
block.
● You press a key. The time is extended each time a key is pressed.
● A new alarm is read from the S7-200 CPU
When the display backlight is turned on, the backlight is on for the time that you configured in
the TD Setup menu.
If the backlight is currently off and you press a key, the first keypress will turn on the
backlight, but will not execute the key function. You must press the key a second time to
execute the key function. There will be no audio or visual feedback for the first keypress that
turns on the backlight. This lets you know that the key did not execute the key function and
you must press the key again.
If your TD400C has an alarm that requires acknowledgement (an alarm that flashes or
blinks), and that alarm is enabled, the display backlight will be on until you acknowledge the
alarm.