I am using a PCI-MIO-16XE-50 card to control a lab setup and collect data. I got a problem in digital input as follows:
the objective of using this digital input channel is to shut down the
reactor when the reactor is flooded. I used a 5 voltage battary and
creat a circute on the reactor. When the reactor is flooded, an
external 5 V will be applied on the digital input channel. A true value
(alarm) can be received from this digital chanel and the reactor can be
shut down.
A few month ago, this concept worked well. However, the default voltage
on the digital input channel was not stable. A few month ago, the
default value was zero and now it becomes 5 V.
Any suggestions?
