Analog input modules
D300529 0115 - BL67 I/O modules6-46
Diagnostic data
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
:
NOTE
Byte Bit Diagnostics Meaning
Inputs
NOTE
-----Overflow/
unde
rflow,
OUFL
Wire break Measured value
out of range
In the 12-bit-representation (left-justified) the diagnostic data are transmitted with the lower
nibble of the process data for the respective channel.
Table 6-32:
Diagnostics
0 - 3 0 Measured value out of range Indicates an exceeding 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.
1 Wire break Indicates an open circuit in the signal line
for the operating mode:
Only in current measurement 4 to 20 mA
2 Overflow/underflow The measurement value is below the value
ranges and the device is not able to cap-
ture these values.
In the current measurement ranges, the module switches automatically to the voltage mea-
surement after 300 ms if I > 40.0 mA. For the 300 ms, a current of max. 500 mA is accepted.
After this, a periodical switching to current measurement is done. If the current falls again to
the permissible range, the module switches permanently back to current measurement.
During this procedure, the transmitted value is always the measurement range end value.
Please observe the module’s maximum input voltage!
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