Unit functions
RESM-5
Page 37
B.)
Alarm output (terminals 18+12):
This output is set in the factory as follows:
•
LOW (OPEN)
if error code 104…106, 111…113, or
211 is displayed. However, the contact closes if a
"START" signal on the temperature controller is
present in one of these states.
•
HIGH (CLOSED)
if error code 101…103, 107, 108,
109, 201…203, 801, or 9xx appears.
If the alarm output has the opposite configuration to the
factory setting (
section 8.2.7 "Configuration of the
alarm output" on page 19), these states are reversed.
C.)
Error code indicated via the actual value
output 0…10VDC (terminals 20+24):
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 a fault.
Thirteen voltage levels are available for this purpose in
the 0…10VDC range, each of which is assigned an
error code (
section 9.18 "Error messages" on
page 37).
If a state that requires AUTOCAL occurs – or if the unit
configuration is not correct – (error codes 104…106,
111…113, 211), the signal at the actual value output
jumps back and forth at 1Hz between the voltage value
corresponding to this error and the end of the scale
(10VDC, i.e. 300°C or 500°C). If the "START“ signal on
the temperature controller is set in one of these states,
the voltage value does not change any more.
An error message can only be reset by
pressing the "RESET" key, activating the
"ALARM-IN/RESET" signal at terminals 7+14
(
section 9.9 ""ALARM-IN/RESET" signal" on
page 33), or switching the RESM-5 off and then on
again.
Invalid error messages may appear when the
RESM-5 is switched off owing to the
undefined 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.
9.18
Error messages
The table below shows how the analog voltage values
that appear at the actual value output correspond to the
errors that have occurred. It includes a description of
each error and the required corrective action. The block
diagram in section 9.19 "Fault areas and causes (main
RESISTRON controller)" on page 41 enables a
particular error to be cleared quickly and efficiently.
The error codes described below can also be displayed
using
the
ROPEX
visualization
software
(
section 9.16 "Diagnostic interface / visualization
software" on page 36) 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
incorrectly interpreted. Please note the tolerances
of the actual value output (
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