D300717 1211 - BL20 I/O modules
6-49
Analog input module, 8AI voltage/current and 4 Pt/Ni
The module has the following diagnostic messages available per channel:
Measurement value range error "Out of Range"
OoR
Indicates an exceed or undercut of the value ranges.
–
Limit values according to parameterization,
ff.
The permissible measurement value limits are exceeded, it is thus possible that no valid measurement
value can be detected.
"Wire Break"
WB
Display of a wire break in the signal line for the operation mode.
–
in temperature measurement
–
in resistance measurement
–
in current measurement 4 to 20 mA
→
limits see
ff.
"Short circuit"
SC
–
in temperature measurement:
threshold: 5
Ω
(loop resistance)
"Over-/Underflow"
OUFL
The measured value exceeds the measurement range and the module can not detect these values.
–
limits according to parameterization,
ff.
"Hardware error"
HW Error
–
Shows common errors of the module hardware. The return value analog value in case of
an error is "0"
Note
3-wire measurements with Pt100 sensors cannot differentiate between a short-circuit and an
open circuit at temperatures below -177 °C. In this case, the diagnostic "short-circuit" is
generated.
Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: [email protected]