Operation
5.8.5.1 Hardware Diagnostics
5.8.5.1.1 Input States
When Input States is selected from the menu, the input states of the I/O board are
displayed. The logic is negative true; therefore a 0 indicates that an input is
engaged and a 1 indicates that an input is disengaged. The only inputs supported
by the drive cabinet are the first five (EM STOP, MAINT, SUM LIM, AZ DRIVE FLT,
AND EL DRIVE FLT). If all five inputs are in the 1 state, the 7200 ACU interprets
this condition as a no-power condition at the drive cabinet.
5.8.5.1.2 Output States
If Output States is selected from the menu, the screen shows the current output
states from the I/O board. Outputs are negative true; therefore, 0 for one of the
drive lines (AZ CW, EL UP) indicates movement in that direction. DRIVE ENABLE is
0 if the drive cabinet is enabled (powered). For beacons (B1 - B4), the one
showing 0 is the beacon selected. SUM ALM is 0 for OK and 1 for fault.
5.8.5.1.3 A/D states
A/D States provide the status of the A/D states for the channel. The display
shows raw data, the 12-bit data from the A/D board (in hexadecimal and binary),
and the status of three flags as follows:
• If the flags are off, the display shows "---"
• An O indicates that the A/D is over range (saturated)
• An S indicates sign, which is true if a positive voltage is present; negative
voltage readings are unusable
• An N indicates that a new value is ready (N will normally be flashing on and off)
5.8.5.1.4 Optical Encoders
Optical Encoders shows, in real time, the errors occurring on the serial link from
the optical encoders and the CPU. This screen can only be accessed if Encoder
type is set to an optical encoder type in the Position configuration... menu.
This information is most useful during the installation of the system. There are no
"acceptable" limits, but for proper operation, the values must remain five percent
or less.
5-38
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