Operate project
9.1 Basic principles of operation
TP 270, OP 270, MP 270B (WinCC flexible)
Operating Instructions, Edition 03/2004, 6AV6691-1DD01-0AB0
9-11
9.1.3 Operating a keyboard device
9.1.3.1 Functions of the system keys
Overview of system key functions
Note
The availability of system keys is determined by the HMI device used.
Key Function Purpose
A-Z
Shift (digits/letters) Toggles the assignment from numbers to letters.
• No LED is lit:
The number assignment is enabled. One actuation of the
button toggles to letter assignment.
• One LED is lit:
The left or right letter assignment is enabled.
Each time the key is pressed, the system toggles between the
right letter assignment and number assignment.
INS
DEL
Deleting characters
• Deletes the character at the current cursor position.
ESC
Cancel
• Deletes the input characters of a value and restores the
original value.
• Closes the active window.
ACK
Acknowledge Acknowledges the currently displayed error alarm or all
alarms of an acknowledgement group (group
acknowledgement.)
The LED is lit as long as unacknowledged error alarms are
queued.
HELP
Display operator notes Opens the configured operator note for the selected object
(e.g. a alarm, I/O field.) The LED signals an that an operator
note exists for the selected object.
ENTER
Enter
• Applies and closes the input
• Opens a drop-down list for symbolic I/O fields
• Triggers buttons
TAB
Tab Selects the next available screen object in the configured tab
sequence.
Deleting characters Deletes the character to the left of the current cursor position.
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