5 Operation
5.5 CPU self-diagnostics
Manual
SIPART DR21
C73000-B7476-C143-08
179
5.5
CPU self-diagnostics
The CPU runs safety diagnostics routines which run after only one reset or cyclically. The CPU
is familiar with two different types of reset:
Power On--Reset
always take 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 structures are reloaded from the user program memory into the RAM. The
current process variables and the controller status are reloaded from the EEPROM for these
data.
At S83 = 1 the digital w/x- display flashes as an indication after a Power-On-Reset, acknowl-
edgement is by the Shift key (6) for w/x digital display.
With S83 = 0, the flashing is suppressed.
Watch_dog Reset
The processor has an integrated watchdog which monitors the cyclic program runs indepen-
dently.
When a watch-dog reset occurs the parameters and structures from the user program memory
are loaded into the RAM. The current process variables and the controller status are read out of
the RAM for further processing.
There are no flashing signals on the front module.
tESt appears for a maximum 5 s in the digital w/x display after every reset.
Every detected error of the self--monitoring leads to a flashing error message on the digital w/x
display with defined states of the analog and digital outputs.
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 are still controlled properly
or the outputs themselves are still functioning.
Error message w/x
display
Monitoring of
Monitoring time
Primary cause of the error/remedy
during monitoring tESt
in the case of an error
CPU
EEPROM,
RAM, EPROM
after every reset
monitored components of the CPU or
EEPROM defective/change front module
MEM
EEPROM
when storing
EEPROM defective/change front module
OP.1.* 1)
Data communi-
cation slot 1:
UNI-module
cyclic
Option not plugged, defective or S6
does not correspond to plugged option /
plug or change option or correct S6.
OP.*.3 1)
Data communi-
cation slot 3
4DO + 2DI or 5
DI option
cyclic
Option not plugged, defective or S22
does not correspond to plugged
option / plug or change option or correct
S22
2)
1)
also double error display OP.1.3 possible. * means digit dark
2)
If 2DO relay is selected with S 22 = 3, no monitoring takes place.
At DI3 to DI7, S22 = 2 the effect of the digital inputs (after inversion) are set to 0 in the event of an error.
Table 5-8
Error message of the CPU
Summary of Contents for SIPART DR21
Page 1: ...SIPART DR21 C73000 B7476 C143 08 1 SIPART DR21 6DR 210 Edition 08 2010 Manual ...
Page 2: ...SIPART DR21 C73000 B7476 C143 08 2 ...
Page 148: ...4 Installation 4 2 Electrical Connection Manual 148 SIPART DR21 C73000 B7476 C143 08 ...
Page 180: ...5 Operation 5 5 CPU self diagnostics Manual 180 SIPART DR21 C73000 B7476 C143 08 ...
Page 242: ...Manual 242 SIPART DR21 C73000 B7476 C143 07 ...