Good Morning. I am working with an SDM-IO16 to which I am going to connect sensors all / nothing that I configure with the following function:
SDMIO16 (ENTRY (), IO16_STAT1,1,90,2222,2222,2222,2222,1.0,0).
My problem comes when once all the inputs are set they are automatically set high and to cause change in the input I have to apply 0v. I do not have anything connected to the inputs.
I only configure and make the following voltage measurements:
between mass and input: 5v
between mass and mass: 0v
between input and 5v: 0v.
Are the entries in this module negative logic?
How can I reverse the logic?
The inputs are not negative logic, but to allow easy use with volt-free contacts, the input is biased to 5V via a 100K resistor. Please see figure 2 in the manual which shows you the input circuit.
The 5V bias should not affect most active logic level systems.