D300529 0115 - BL67 I/O modules
6-71
BL67-4AI-TC, thermo element
This module has the following diagnostic data per channel:
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Measured value out of range
Indicates an exceed or undercut of the value ranges.
The permissible measurement value limits are exceeded, it is thus possible that no valid measure-
ment value can be detected.
Thermocouple wire break
Displays a wire break in the signal line.
Cold junction compensation wire break
The Pt1000-sensor for the respective channel in the base module is defective.
→ the Pt1000-sensor of the other channe
l is taken as cold junction.
→ A cold junction temperature of 23 °C is presumed.
Common Mode voltage out of range
The difference in potential between th
e measuring voltages is too high.
The potential difference of the measuring voltages of a group of sensors is monitored: channel 0/1
r
esp. channel 2/3.
Remedy:
– Check the insulation of the sensors.
–
Check the difference in potential between non-insulated sensors
– If the sensors are not insulated, use channels of different sensor groups (e.g. channel 1 and chan-
nel 3).
Hardware failure
Shows common errors of the module hardware.
The return analog value in case of an error is "0".
Hardware
failure
xx
xCommon Mode
voltage out of
range
Cold junction
compensation
wire break
Thermocou-
ple wire
break
Measured
value out
of range
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