Rockwell Automation 8520 9/Series CNC Integration Maintenance Manual Documentation Set - Manual (Page 550)

I/O Interface
Section 10A
10A-27
Figure 10A.20 and Figure 10A.21 show the digital I/O input circuit
diagrams for ac and dc applications.
Figure 10A.20
Digital I/O ac Input Circuit Diagram (E151, E152)
Signal source Digital I/O Module
Photo-
coupler
PE
Com.
ac power
supply
L1
L2
11325-I
Figure 10A.21
Digital I/O dc Input Circuit Diagram (E153, E154)
Signal source Digital I/O Module
dc power
supply
Com.
Photo-
coupler
PE
11326-I
Table 10A.P through Table 10A.T list the output specifications for the 4
types of digital I/O. It is recommended that some type of surge suppressor
be used when switching inductive load devices with hard contact outputs.