Steve Etter
Lifetime Supporting Member + Moderator
Hi all,
I am using a GE Fanuc IC693ALG442 Analog (4 In/2 Out) I/O module with a 90-30 363 processor. In my application, I have a two descrete 5K ohm potentiometers with a single, externally supplied 10VDC source for two input points on this card (%AI2 and %AI4). I also have a third descrete 5K pot with a separate 10VDC source as a third input point (%AI4). The two sources are completely isolated from each other and the rest of the machine as well. The last input is a 4-20mA signal (%AI1)..also completely isolated from the rest of the machine. My programming software is VersaPro.
My problem: When monitoring the %AI2 value using my laptop or the HMI (a Mitsubishi E910 touchscreen), it is fluctuating by as much as +/- 10% while the input voltage remained steady (measured using a Fluke 23 Multimeter).
I tried removing the second pot from the circuit but this had no affect (I am not surprised since the input voltage is constant already anyway).
The input is only called in one point in the applicatation program and I have verified this.
Aside from being able to tell it that the input is a voltage or current type, there appear to be vertually no other calibration factors available for this card that I have found.
Does anyone have any clue what could be causing this problem or how to resolve it? I have not yet contacted GE...thought I might ask y'all first.
Steve
I am using a GE Fanuc IC693ALG442 Analog (4 In/2 Out) I/O module with a 90-30 363 processor. In my application, I have a two descrete 5K ohm potentiometers with a single, externally supplied 10VDC source for two input points on this card (%AI2 and %AI4). I also have a third descrete 5K pot with a separate 10VDC source as a third input point (%AI4). The two sources are completely isolated from each other and the rest of the machine as well. The last input is a 4-20mA signal (%AI1)..also completely isolated from the rest of the machine. My programming software is VersaPro.
My problem: When monitoring the %AI2 value using my laptop or the HMI (a Mitsubishi E910 touchscreen), it is fluctuating by as much as +/- 10% while the input voltage remained steady (measured using a Fluke 23 Multimeter).
I tried removing the second pot from the circuit but this had no affect (I am not surprised since the input voltage is constant already anyway).
The input is only called in one point in the applicatation program and I have verified this.
Aside from being able to tell it that the input is a voltage or current type, there appear to be vertually no other calibration factors available for this card that I have found.
Does anyone have any clue what could be causing this problem or how to resolve it? I have not yet contacted GE...thought I might ask y'all first.
Steve