Hello.
I am trying to figure out how to setup a PID in Control Logix 1769 Controller in a way that it would control a drive speed by sending -10V to 10V depending on the position error.
Right now it seems that the PID instruction that I setup only works one way. If the position < set point, the output % is positive. Once the position crosses the setpoint and goes past it (the position error becomes negative), the output drops to 0%.
How can I make the PID set output to negative, to correct the negative error?
I am trying to figure out how to setup a PID in Control Logix 1769 Controller in a way that it would control a drive speed by sending -10V to 10V depending on the position error.
Right now it seems that the PID instruction that I setup only works one way. If the position < set point, the output % is positive. Once the position crosses the setpoint and goes past it (the position error becomes negative), the output drops to 0%.
How can I make the PID set output to negative, to correct the negative error?