Controller functions
RES-403
Page 31
An alarm can only be reset by switching the
controller off and then on again.
Invalid alarm signals may appear when the
controller is switched off owing to the unde-
fined operating state. This must be taken into
account when they are evaluated by the higher-
level controller (e.g. a PLC) in order to avoid false
alarms.
9.12
Error messages
The table below shows how the analog voltage values
correspond with the faults that have occurred. It also
describes the fault and the required corrective action.
The error messages are listed in two separate tables for
controllers "up to September 2005" and "as of October
2005". The block diagram in section 9.13 "Fault areas
and causes" on page 36 permits each fault to be
cleared quickly and efficiently.
13 voltage levels for fault diagnostics appear at the
actual value output of all controllers manufactured as of
October 2005. The error messages are differentiated
even more finely in the controller. The error codes
described below can be displayed with the ROPEX
visualization software (
ª
interface/visualization software (as of October 2005)"
on page 30) to facilitate troubleshooting.
If the actual value output is evaluated in order
to identify an error message - in the higher-
level controller, for instance - the tolerance window
must be adjusted to prevent it from being incor-
rectly interpreted. Please note the tolerances of the
actual value output (
ª
ª
ª
ª
!
!
!
