Rockwell Automation 1791-XXXX Discrete I/O AC and DC Block I/O Input and Output Modules - Manual (Page 16)

I/O Interface and System Design
Chapter 2
2-6
Figure 2.6
Simplified Schematic of ac Output Circuit
Opto
Isolation
Indication
LED
(logic)
System
Circuitry
L1
L2
20-132V ac
10 Ω
0.033 µ F
178 Ω
75 Ω
R
L
Output
Common
Out
When sizing output loads, check the documentation supplied with the
output device for the surge and continuous current needed to operate the
device. Refer to Table 2.A to determine which Allen-Bradley products
will directly interface to the outputs.
Example: The output device is an ac solenoid operated air valve with an
inrush current (surge) of 1.995A for 10ms and a holding current
(continuous) of 275mA. Figure 2.7 shows that the load of the output
device is within the operating specifications of the ac output.
Figure 2.7
ac Output Drive Current Load for ac Air Valve
10A
300mA
0
10ms
Time
Current
0
Surge
Continuous
2A
1.995A
275mA
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