Controller functions
Version 1
RES-406
Page 49
D.)
Error code output via the 0
…
10VDC analog
output (terminals 17+18):
Since a temperature indication is no longer necessary if a fault occurs, the analog output is used to dis-
play error messages in the event of an alarm.
13 voltage levels (up to January 2006: 12 voltage levels) are offered for this purpose in the 0…10VDC range, each
of which is assigned an error code (
section 7.16 "Error messages" on page 49).
If a state that requires AUTOCAL occurs – or if the controller configuration is not correct – (error codes 8…12;as
of February 2006 also: 104…106, 111…114, 211, 302, 303), the signal at the analog output jumps back and forth
at 1Hz between the voltage value which corresponds to this error and the end of the scale (10VDC, i.e. 300°C or
500°C). If the "ST" bit is activated in one of these states, the voltage value does not change any more.
An alarm can only be reset by activating the „RS“ bit or by switching the controller off and then on
again.
If an error message is reset using the "RS" bit, the "RS" bit must be deactivated first.
Invalid error messages may appear when the controller is switched off owing to the undefined oper-
ating 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.
7.16
Error messages
In addition to the fault diagnosis which is coded in the protocol, you can also access the PROFIBUS diagnostics
function (extended controller diagnosis). The error codes appear in the configuring tool in plain text, because they
are stored in the device master file.
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 January 2006" and "as of
February 2006". The block diagram in section 7.17 "Fault areas and causes" on page 54 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
February 2006. The error messages are differentiated even more finely in the controller. The 3-digit error codes
described in brakets below can be displayed with the ROPEX visualization software (
interface/visualization software (as of February 2006)" on page 47) to facilitate troubleshooting.
If the actual value output is evaluated in order to identify an error message - in the higher-level con-
troller, for instance - the tolerance window must be adjusted to prevent it from being incorrectly
interpreted. Please note the tolerances of the actual value output (
page 57).
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