C-DIAS SAFETY CPU
CSCP 012
1.6
Page 23
Command Selection sequence
After the Start sequence, the desired command is selected. This selection is made with
button presses in the following time intervals: Minimum press duration is 200 ms, maximum
is approximately 3 seconds; the minimum pause between individual button presses is 200
ms, the maximum is 20 seconds. After each correct button press (incl. the minimum pause
of approx. 200 ms), the selected command is shown with LEDs C1, C2 and C3. If an invalid
command is selected (see "valid commands"), the Error sequence is initiated; as with not
correctly observing the time intervals. LED B lights continuously during this sequence.
End sequence
This sequence is used to confirm the selected command. Here, the button is pressed until
LED starts to blink (approx. 3 seconds, blinks in a slow interval). The number of light pulses
in LED B depends on the previously selected command (see "valid commands").
After the LED turns off, the button must be released. After the minimum pause of approxi-
mately 200 ms, in which the button must not be pressed, the service mode is imitated and
the command is executed.
If the button pressed for longer than approximately 3 seconds, the selected command is
not accepted and the Error sequence is displayed. The same applies when the button is
released too soon or the minimum pause of 200 ms is not observed. After executing the
command, the corresponding mode is initiated depending on the command (see "Valid
Commands").
If executing the command leads to an error (i.e. because SET_VERIFIED should be exe-
cuted although no valid configuration data is available in the Safety CPU), the Error se-
quence is initiated.
Error sequence
If an invalid button press occurs, as in the sequences described above, the Error sequence
is initiated. LED B indicates this sequence with fast blinking, which lasts for at least 3 sec-
onds.
If the button is still pressed after 3 seconds, LED B will continue to blink until the button is
released and a minimum pause of approximately 200 ms has elapsed. The Start sequence
cannot be reinitiated until LED B stops blinking.
After ending the Error sequence, the mode is changed as described in "Overview of Mod-
ule Statuses". If turned on, LEDs C1, C2 and C3 are turned off after ending the Error se-
quence.
