Description of the Firmware
4–13
IP244
C79000–B8576–C860–02
S Line break
All analog inputs with sensors directly connected (thermocouples, Pt 100s) are checked for
line break.
If a line break is detected (no actual value present), the following reactions are triggered
depending on the configuration:
control is disabled and a manipulated variable averaged over a selectable period
of time is output until the line break is dealt with (emergency program,
see Section 2.3).
or
the manipulated variable is disabled until a percentage value for the manipulated
variable is entered manually (manual manipulated variable).
or
the module switches automatically to a substitute sensor (or analog input)
connected to a different input, if inputs are still free. The substitute sensor bit is set
and
error identifiers are set (line break message A and B) and the maximum value
(460 to 3063 _C) is indicated as the actual value.
S Summary of the messages
Individual error bits are set separately for each controller (0 to 12) in the following situations:
– 1st positive tolerance exceeded,
– value below 1st negative tolerance,
– 2nd positive tolerance exceeded,
– value below 2nd negative tolerance,
– temperature setpoint too high,
– lower setpoint higher than temperature setpoint or too high,
– line break in thermocouple or Pt 100,
– switch over to substitute thermocouple,
– short circuit at the Pt 100,
– short circuit identified with thermocouple.
To Next Page
Loading...
