Manual
1 Technical Description
1.4 Function principle
1.4.3 CPU self-diagnostics
20
SIPART DR22 6DR2210
C79000-G7476-C154-03
!
WARNING
The relays used on the interface relay module are designed for a
maximum rating of AC 250 V in overvoltage class III and
contamination factor 2 according to DIN EN 61010 Part 1.
The same applies for the air and creep lines on the circuit board.
Resonance increases up to twice the rated operating voltage may
occur when phase shift motors are controlled. These voltages are
available at the open relay contact. Therefore such motors may only
be controlled under observance of the technical data and the
pertinent safety conditions via approved switching elements.
1.4.3
CPU self-diagnostics
The CPU runs safety diagnostics routines which either can only after a reset or cyclically. The
CPU is familiar with two different types of reset.
-- Power on reset
Power-On-Reset always takes place when the 5-V supply drops below 4.45 V, i.e. the power
supply is interrupted for longer than specified in the technical data.
All parameters and configurations are reloaded from the user program memory into the
RAM.
At S100 = 1 the digital x-display flashes as indication after a Power-On-Reset, it is
acknowledged by the Shift key (12).
Flashing is suppressed by S100 = 0.
-- Watch dog reset
When a watch-dog-reset occurs the parameters and configurations from the user program
memory are reloaded into the RAM. The current process variables and the status signals are
read out of the RAM for further processing.
There are no flashing signals on the front module.
CPU-tESt appears in the digital displays dd1 and dd2 for a maximum 5 s after every reset.
Every error detected by the self-diagnostics leads to a flashing error message on the digital dis-
plays dd1 and dd2 with defined states of the analog and digital outputs. The fault message out-
put St of the y
hold
module becomes low. The reactions listed in the table are only possible of
course (since this is a self-test) if the errors occur in such a way that the appropriate outputs or
the front module can still be controlled properly or the outputs themselves are still functioning.
There are other error messages for the input range which indicate defective structurings within
this range (see chapter 1.5.6 ”Error messages”, page 99).
In addition error messages are output in the adaptation (see chapter 3.3.2
”Parameterization mode AdAP”, page 173).
The digital displays flash in the case of error messages.
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