Rockwell Automation 8520 9/Series CNC Integration Maintenance Manual Documentation Set - Manual (Page 731)

Section 15A
Troubleshooting the Control
15A-21
The device number of the selected 1771 I/O Adapter device appears under
the “1771 I/O ADAPTER” heading. This will be a decimal number from
00 to 60. Following the number is the message indicating whether it is a 4,
8, 12, or 16 slot rack.
If the selected device is a 8, 12, or 16 slot rack, two or three screens may
be required to display all of the I/O data. When additional screens are
available, press and hold the [SHIFT] key and press the
[DOWN-ARROW] key to access additional screens with I/O data from
the same 1771 I/O Adapter. Cursoring down below the last row on each
screen will also access the next screen if it exists.
The 1771 I/O Adapter Diagnostic screen displays the inputs and outputs
that correspond to the terminal numbers on the 1771 I/O Adapter module.
They are listed in rows with each row representing a slot in the rack. Since
there can be 8, 16, or 32 terminals per slot, the 32 terminal slots will
require two rows of the display.
If an input or output is “ON”, its terminal number appears in inverse video.
If there is no I/O module in a slot, “EMPTY” follows the slot number.
This is a real time display, and its response is limited only by delays in
screen updates.
If more than one 1771 I/O Adapter is on the I/O Ring, a diagnostics screen
for each of these devices can be displayed. To display a diagnostics screen
for the next 1771 I/O adapter on the ring, while on the last page of the
current 1771 I/O adapter press and hold the [SHIFT] key and press the
[DOWN-ARROW] key.
Pressing the exit softkey (up arrow) at any time displays the Ring I/O
Menu screen.