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Chapter Six: Embedded Web-Based GUI and Diagnostics Setup Mode
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through Ethernet (see notes below), watch the MFC’s performance on the plot, and capture flow and other
parameter data from the MFC.
Note
For Analog units, sending a setpoint through Ethernet will not work unless the Analog checkbox
is selected. This checkbox tells the device to bypass the analog setpoint on the analog/power
interface. To begin sending setpoints through the analog interface again, either uncheck the
Analog checkbox or close the browser.
Note
If optional input control is enabled, set points (whether over analog I/O or Ethernet) will control
the optional input.
Figure 25: Embedded GUI, Plot Page in Setup Mode
Before a MFC leaves the factory the performance is checked with Nitrogen in a typical application. During
this test the control parameters are set so that the device’s performance is optimized. These parameters are
expected to work with our setup with the exception of the optional input control (analog 15 pin D only). If
optional input is enabled, you will see tuning PID parameters and a minimum command current offset that
can adjust for overshoot. To change the current PID variables in the device, enter in a value for the Kp
(gain), Ki (integral) and/or Kd (derivative) parameters and press the “Submit” button. For information on how
to tune your MFC for optimal performance please see
Tuning the MFC Mass Flow Controller
.