turck BL20 Series - 8.8.5 Module parameters

157
2020/09
Diagnostics
This module has the following diagnostic data per channel:
8.8.5 Module parameters
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Hardware
error
- - - Overflow/
under-
flow,
OUFL
overcur-
rent
Wire
break
Measured
value out
of range
Diagnostics Meaning
Measured value out of range Indicates an exceeding or undercut of the value ranges.
 Limit values according to parameterization,
page 161 ff.
The permissible measurement value limits are exceeded, it is thus
possible that no valid measurement value can be detected.
Wire break Indicates an open circuit in the signal line for the operating mode:
in temperature measurement
in resistance measurement
in current measurement 4…20 mA
 limits see
page 161 ff.
overcurrent in temperature measurement: threshold: 5 (loop resistance)
Overflow/underflow, OUFL The measurement value is below the value ranges and the device
is not able to capture these values.  limits see
page 161 ff.
Hardware error Shows common errors of the module hardware.
The return analog value in case of an error is ”0”.
NOTE
In 3-wire measurement with PT100- sensor and at temperatures of below -177 °C, the
module can not distinguish between short-circuit and wire break. In this case a ”short-cir-
cuit”- diagnostic is generated.
NOTE
In the current measurement ranges , the module switches automatically to the voltage
measurement 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!
NOTE
Due to a product actualization, the parameter texts of the Turck I/O-products have been
revised.
The actual configuration files (GSD-, GSDML-, EDS-files) with the new parameters can be
found under www.turck.com.
If you use older configuration files with old parameter texts (issue date before April 2014),
then you can find a cross reference list in the manual's appendix (see Cross reference list
parameters (page 523)).