Pleiger Elektronik
GmbH & Co. KG
Edition: 6/2007 Subject to modifications
Manual for 362MC
Page: 25
6
Monitoring functions and error messages
Numerous monitoring functions are integrated in the 362MC. These functions are
executed during the programme start or in the background during normal running of the programme, and
monitor the controller for correct, error-free functioning. When errors are established in a monitoring
function, a corresponding
error message appears in text form on the LCD display.
In order to highlight the error message, the error is displayed in
flashing
mode (flashing cycle approx.
1 second), in alternation with the operational display. Should the established error be a
serious error
which might impair the controller´s functions, an
alarm will be activated
and the
control programme
will be stopped.
Upon activation of an alarm, the alarm relay is de-energised (closed-circuit principle).
See also
Explanatory note on
limit value alarm (5.3.3)
6.1
System monitoring functions
Basic
system monitoring functions
are executed each time the supply voltage is switched on and
prior
to starting
the standard controller programme. The appurtenant error messages are shown in the table
below. See also
Explanatory notes
6.1.1 Explanatory note on Param error
When the parameters are loaded from the parameter memory, a checksum is generated as a 16-bit CRC
and compared against the stored checksum. If the two check sums are not identical, the error signal will
be output. This error may occur when the parameters are loaded during the programme start or during
commissioning, when loading profiles, for example. The controller programme cannot be started.
When this error applies, the 362MC loads the
factory presets
as a precautionary measure. Please check
urgently
, in the following order:
- the
profiles
of both controllers - incorrect profiles will be reloaded after entering the correct profile no.;
- the
parameters
in each profile and each parameter set - errors are corrected by entering the correct data;
- repeat the check by
resetting
the controller.
6.1.2 Explanatory note on ROM error and RAM error
When the programme is started, the checksum of the ROM programme memory is generated and com-
pared against the stored checksum. The main memory is also tested by writing test patterns and check-
reading. Should errors occur, it will not be possible to start the controller programme.
Repeat the test by
resetting
the controller.
If the error occurs again, the controller is to be replaced.
Display
Contrl. Monitoring function
Additional measures
indication
Stop
ERROR
ERROR
ERROR
ERROR
ERROR
Yes
Check on contents of
parameter memory
Controller programme will not be started!
It is
Param
Param
Param
Param
Param
by 16-BIT CRC with generator polynominal
urgently necessary to check all parameters !
Check the system again via
Reset
.
ERROR
ERROR
ERROR
ERROR
ERROR
Yes
Check on contents of
programme memory
Controller programme will not be started!
ROM
ROM
ROM
ROM
ROM
by 16-BIT CRC with generator polynominal
Error indicates
external EMC disturbance
or component defect.
ERROR
ERROR
ERROR
ERROR
ERROR
Yes
Check on
main memory
Re-check system via
Reset
.
RAM
RAM
RAM
RAM
RAM
by writing test pattern and check-reading
In case of error after Reset - replace controller.
See also
Explanatory note on Reset (6.1.3)
ERROR
ERROR
ERROR
ERROR
ERROR
The programme restart is initiated by the
Controller programme is started!
Watchdog
Watchdog
Watchdog
Watchdog
Watchdog
programme run monitoring function (
Watchdog
)
Error indicates
external EMC disturbance
.
or by the hardware reset function (
HW reset
).
Acknowledge error with
Exit
and check for
ERROR
ERROR
ERROR
ERROR
ERROR
The system monitoring function did not
any accumulations.
HW reset
HW reset
HW reset
HW reset
HW reset
detect any errors during the start!