Operating Mode Selection; Operating Mode Keys - Siemens SIMATIC C7-635 Manual

Special Features of the C7-635
4.1

Operating Mode Selection

Status and error LEDs
Figure 4-1
Changing the C7-CPU Operating Mode
The figure above uses the C7-635 Touch as an example. The function and position
of the operating mode keys and the status and error LEDs are the same for the
C7-635 Key.
Select the CPU operating modes RUN, STOP, and MRES as follows using the

operating mode keys:

Each time you press a key, the CPU mode changes. The key must be pressed for
at least 500 ms for the change to take place and the corresponding key LED (R, S,
M) to illuminate. The key LEDs do not reflect the CPU operating mode, rather,
they indicate the setting of the operating mode keys.
The key function can be activated and deactivated by means of the external
authorization inputs AT1 and AT2 to prevent the C7-CPU operating modes from
being changed in an uncontrolled manner (for example, by unauthorized operating
staff).
4-2
C7-635 Touch
Operating mode keys with touch LEDs
C7-635 Control System
A5E00155581-04