11
Fault codes
When the internal self-supervision system has
detected a permanent fault, the red IRF indica-
tor is lit and the output relay of the self-super-
vision system operates. In addition, in most fault
situations an autodiagnostic code is displayed.
The code is composed of a red figure 1 and a
green code number. Below is a list of some of
the most general fault codes appearing in the
module SPCN 1D56.
Fault code
Type of error
4
Output relay path broken or relay board missing
30
Faulty program memory
50
Faulty working memory (RAM)
51…54
Parameter memory (EEPROM) faulty
56
Parameter memory (EEPROM) key faulty.
Format by writing "2" to variable V167
195
Reference channel voltage too low
203
Reference channel voltage too high