Rockwell Automation 1747-L40 SLC 500 Fixed Hardware Style - Manual (Page 27)

Chapter 1
Selecting Your Hardware Components
1–8
Relay Contact Ratings
Maximum
Volts
Amperes
Make Break
Amperes
Continuous
Voltamperes
Make Break
240 VAC
120 VAC
7.5A
15A
0.75A
1.5A 2.5A 1800 VA 180 VA
125 VDC 0.22A 1.0A 28 VA
24 VDC 1.2A 2.0A 28 VA
To calculate make and break ratings for other load voltages, divide the
voltampere rating by the load voltage; for example:
28 VA/48 VDC = 0.583 A
For the 20, 30, and 40 I/O fixed controllers, an optional 2–slot expansion
chassis lets you add two additional I/O modules providing even more
versatility. The power supply provides backplane power for the modules in
the optional expansion chassis.
Refer to chapter 3 for chassis dimensions and chapter 4 for mounting
directions.
There are three types of I/O modules: input, output, and combination I/O.
They are available in a wide variety of densities including 4, 8, 16, and 32
point and can interface to AC, DC, and TTL voltage levels. Output modules
are available with solid–state AC, solid–state DC, and relay contact type
outputs.
For a complete, up–to–date listing of discrete I/O modules and their
specifications, contact your Allen–Bradley sales office for the latest product
data entitled Discrete Input and Output Modules, Publication Number
1746–2.35.
Refer to chapter 4 for installation directions.
The SLC 500 family offers specialty I/O modules that enhance your control
system. These modules range in function from analog interface to motion
control, from communication to high–speed counting.
For a complete, up–to–date listing of specialty I/O modules and their
specifications, contact your Allen–Bradley sales office for the latest System
Overview entitled SLC 500 Family of Small Programmable Controllers,
Publication Number 1747–2.30, or for a related product data.
Refer to chapter 4 for installation directions.
Selecting the 2-Slot Chassis
Selecting Discrete I/O
Modules
Selecting Speciality I/O
Modules