turck BL20 Series - 8.10.4 Diagnostic and status messages

Analog Input Modules
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8.10.4 Diagnostic and status messages
LED status displays
Diagnostics
This module has the following diagnostic data per channel:
LED Display Meaning Remedy
DIA Red,
flashing,
0.5 Hz
Diagnostics pending Check the cause for the diagnosis
Red Module bus communi-
cation failure
Check if more than two ad-joining electronics modules
have been pulled.
Check the supply of the module bus.
Off No error messages or
diagnostics
–
0…3 green Channel activated,
normal operation
–
green,
flashing,
0.5 Hz
Channel diagnostics
pending
Check the cause for the diagnosis
Off Channel deactivated –
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Hardware
error
- - - Common Mode
voltage out of
range
Cold junction
error
Wire break
Wire break
thermo
couple
Measured
value out of
range
Diagnostics Meaning
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 measurement value can be detected.
Wire break thermo couple Displays a wire break in the signal line.
Cold junction error
Wire break
The Pt1000-sensor for the respective channel in the base module is
defective.
 the Pt1000-sensor of the other channel is taken as cold junction.
 a cold junction temperature of 23°C is presumed.
Common Mode voltage out of range Potential difference between measurement voltages too high.
Monitoring of the potential difference between the measurement
voltages within one sensor group (sensor groups: channel 0/1 or
channel 2/3).
Remedy:
Check the isolation of the sensors.
In case of non- insulated sensors, check the potential equalization
between the sensors.
If non-insulated sensors are used, it can be necessary to connect
the sensors to channels of different sensor groups (i.e. channel 1
and channel 3).