10 Error handling
Positioner DC 6-06
59
10.3
Error display
The errors are divided into two basic groups. There are errors where operation can be
continued although functionality may be restricted (e.g. sensor errors). The other group are
so-called fatal errors which result in an emergency shutdown of the system (e.g. program
memory errors).
These two error groups are signalled by the following two parameters:
3800
EmergencyAlarm
3801
CommonAlarm
Parameter 3801
CommonAlarm
is set with every error that occurs, 3800
EmergencyAlarm
is only set with fatal errors (
10.7 Emergency shutdown errors)
. Consequently, 3800
EmergencyAlarm
cannot occur by itself.
The common alarm output can be configured so that it is reset for 0.5 s when a new
additional error occurs. A PLC connected to this output can therefore detect the new error.
Parameter 5102
Common-AlarmResetOn
= 1 must be set for this purpose. To also obtain
an edge change when an error clears, 5103
CommonAlarmResetBoth
must also be set to 1.
10.4
Error memory
When the control unit is powered off it loses all its information about the current errors.
However the unit has an integral permanent error memory that provides an overview of
errors that have occurred. Every error that has occurred at least once is stored in this error
memory.
Control units of the type PANDAROS 6-06 contain an enhanced error memory as standard
(
10.4.1 Operating data memory and enhanced error memory
) which logs the number of
occurrences and the times when the error occurred.
For the firmware, the values in the error memory are just display values and are not
otherwise relevant. It only responds to the occurrence of errors during ongoing operation.
The permanent error memory can be viewed using the parameters starting from number
3100. Here the error counter stands for every error that has occurred since the last error
memory reset. The numbers of these historic errors are incremented by 100 compared to
their associated current error.
The permanent error memory can only be reset with the PC or hand programmer. The
control unit then starts to accumulate new errors in the empty error memory.
Once a system has been commissioned, the error memory should always be reset to ensure
that errors which occurred during commissioning, e.g. by sensors that are not yet
connected, are not subsequently evaluated as errors during system operation.
Summary of Contents for PANDAROS DC 6-06
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