Rockwell Automation 8520 9/Series CNC Integration Maintenance Manual Documentation Set - Manual (Page 541)

I/O Interface
Section 10A
10A-18
The Digital I/O provides for an additional 20 inputs and 12 outputs to the
system I/O ring. The digital I/O interface circuits are designed to interface
this I/O device with the fiber optic I/O ring. These circuits use a fiber
optic transmitter and receiver to provide communication with the fiber
optic I/O ring.
The digital I/O receives input signals from external devices assigned to its
input terminals. These signals are sent to PAL, through the I/O ring, to be
used in the ladder logic process. PAL generates signals that are then sent
through the I/O ring to the digital I/O. The digital I/O outputs these signals
to external devices assigned to its output terminals.
This section covers the specifications, connection and the settings for the
digital I/O. Figure 10A.12 shows the digital I/O.
Figure 10A.12
Digital I/O
Fuse Color code location
Optical connector
OUT (OP21)
Optical connector
IN (OP22)
11317-I
There are four types of digital I/O. The four types have different
combinations of power supply and I/O specifications.
10A.3
Digital I/O