Siemens OP17, Equipment Manual

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3-2
Equipment Manual OP7, OP17
Release 04/99
3.1.1 System Keys
A “function key for global function assignment” always activates the same
action on the OP or in the PLC irrespective of the screen currently displayed
(global meaning on the OP). Examples of such actions include:
Opening a screen
Starting a screen printout (Print Screen)
The following keys can be assigned global functions:
OP7:
F1
to
F4
and
K1
to
K4
,
OP17: F1 to F8 and K1 to K16 .
A “function key for local function assignment” or ”soft key” has a screen-
specific (local) meaning.
The function of soft key can differ from screen to screen.
The following keys can be assigned local functions:
OP7:
F1
to
F4
and
K1
to
K4
,
OP17:
F1
to
F8
and
K1
to
K8
.
Two-tier soft keys are particularly suitable for implementing binary states
and machine functions – for example:
ON
OFF
START
STOP
+
–
The system keys are used to make inputs on the OP. They are divided up into
input keys for numerical and alphanumeric characters (numeric keypad) and
control keys (see Figure 3-1).
Function keys for
global function
assignment
Function keys for
local function
assignment (soft
keys)
System keys