Controller functions
Page 34
RES-407
Version 1
This logic output is set in the factory as follows:
•
LOW (OPEN)
in operating states A.1) and A.2), but high (closed) if a "START" signal is activated in one of these
states.
•
HIGH (CLOSED)
in operating state A.3)
If the alarm relay is configured opposite to the factory setting (
section 6.2.3 "Configuration of the alarm output
(as of April 2005)" on page 19), these states are reversed.
C.)
Error code output via the 0 to 10V DC
actual value output (terminals 17+14):
Since a temperature indication is no longer necessary if a fault occurs, the actual value output is used to
display error messages in the event of an alarm.
13 voltage levels (up to March 2005: 12 voltage levels) are offered for this purpose in the 0…10VDC range, each
of which is assigned an error code (
section 7.13 "Error messages" on page 34).
If a state that requires "AUTOCAL" occurs - or if the controller configuration is not correct - (error codes 104…106,
111…114, 211, 302, 303; up to March 2005: error codes 8…12), the actual value output jumps back and forth at
1Hz between the voltage value which corresponds to this error and the end of the scale (10V DC, i.e. 300°C or
500°C). If the "START" signal is activated in one of these states, the voltage value does not change any more.
Selective fault detection and indication can thus be implemented simply and inexpensively using the analog input
of a PLC with a corresponding error message (
section 7.13 "Error messages" on page 34).
An alarm can only be reset by applying a "RESET" signal or by switching the controller off and then
on again.
If an error message is reset using the "RESET" signal, the "RESET" signal 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.
7.13
Error messages
The table below shows how the analog voltage values that appear at the actual value output correspond to the
faults that have occurred. It also describes each fault and the required corrective action.
The error messages are listed in two separate tables for controllers "up to March 2005" and "as of April 2005". The
block diagram in section 7.14 "Fault areas and causes" on page 39 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 April
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 (
section 7.11 "Diagnostic interface/visualization soft-
ware (as of April 2005)" on page 33) 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 42).
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