Siemens S7-200 - Page 104

Operating Your Text Display (TD) Device
5.2 Using the Text Display Device to Access Screens and Alarms
Text Display (TD) User Manual
104 System Manual, 08/2008, A5E00765548-03
Displaying Information on the TD Device
The TD device provides both screens (user-defined menus with associated screens of
information) and bit-enabled alarm messages:
● Menu: A menu is a list of items that select a grouping of related screens. The TD 200,
TD 200C and the TD400C have 8 menus available; the TD 100C has 4 menus available
● Screen or alarm:
– A screen or alarm for the TD 200 and TD 200C displays up to two lines of text that
provide information for the operator. Each line can be up to 20 characters of text and
data. A screen contains up to 40 characters of text and data. An alarm can be either 1
or 2 lines.
– A screen or alarm for the TD400C displays up to four lines of text that provide
information for the operator. Each line can be up to 24 characters of text and data. A
screen contains up to 96 characters of text and data. An alarm can be either 1, 2, or 4
lines.
– A screen or alarm for the TD 100C displays up to four lines of text that provide
information for the operator. (Each line can contain either 12 or 16 characters of text
and data. A screen contains 48 or 64 characters of text and data. An alarm can be
either 1 or 2 lines.)
The textual message of the screen or alarm can convey information for the operator
and can also allow the operator to interact with the S7-200 CPU by changing the
embedded value of a variable (such as a set point or limit).
You can configure the TD device to display screens (which are initiated by operator action)
and bit-enabled alarms (which are generated by the S7-200 CPU). You can also configure
the TD 200 and TD 200C, and TD400C device to display an icon to alert the operator of
some event or action required. (Refer to Chapter 4 for information about configuring the TD
device.)
Tip
Pressing ESC returns you to the previous menu. If there is no activity for 20 seconds (no
button pressed), the TD device returns to the default display mode.
The operator uses the buttons on the keypad to navigate through the menu or a list of text.
Figure 5-2 shows the buttons that an operator could use to navigate from a user menu to the
screens associated with that item in the menu. Figure 5-3 shows how to navigate through the
alarms. The TD 200, TD 200C, and the TD400C have eight menus available, and the
TD 100C has four menus available.