Baker Hughes Apollo 3, User Manual

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Figure 32: Zenith Configuration-Drawing 2
3.4 System Concepts and Definitions
3.4.1 Inputs
Inputs are information sources from the well site (like a pressure gauge). These sources can be
Analog or Digital Inputs, Downhole Sensor data, or Drive data.
Examples of Inputs:
• Pressure sensor connected to an analog input
• Vibration sensor connected to a digital input
• Drive frequency read from the drive using a serial link
• Motor temperature read from a downhole tool using a serial link
How inputs are used in the Apollo system:
• Input data is collected periodically (polled). Polling rate is about 10 times per second for inputs
on the I/O board, about 5 times per second for drive data, once a second for RSTi modules
and about every 5 seconds for downhole data.
• Channel values are formed when input data are scaled, and an algorithm is applied.
• The Apollo system handles all digital and analog inputs the same, whether the inputs are on
the Apollo HMI, the Vector VII drive, the Apollo I/O board, or the downhole sensor.