Memory Backup For The 1747-L511, Slc 5/01 Processor; Selecting Discrete I/O Modules; Selecting Specialty I/O Modules - Allen-Bradley SLC 500 User Manual

2-12 Selecting Your Hardware Components
Time
(Days)
Selecting Discrete I/O
Modules
Selecting Specialty I/O
Modules
Publication 1747-UM011C-EN-P - December 2001

Memory Backup for the 1747-L511, SLC 5/01 Processor

The curve below illustrates the ability of the memory back-up
capacitor to maintain the contents of the RAM in a 1747-L511. To back
up the memory for a longer period of time, a lithium battery, Catalog
Number 1747-BA, is required.
30
25
20
15
10
5
0
0 5 10 15
(41˚F) (50˚F) (59˚F)
There are three types of discrete I/O modules: input, output, and
combination. 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 listing of discrete I/O modules and specifications,
contact your Allen-Bradley sales office for the latest product data
entitled Discrete Input and Output Modules, publication 1746-2.35.
The SLC 500 family offers specialty I/O modules that enhance your
control system. Modules range in function from analog interface to
motion control, from communication to high-speed counting.
For a complete listing of specialty I/O modules and their
specifications, contact your Allen-Bradley sales office for the latest
system overview entitled SLC 500 Programmable Controllers and I/O
Modules, publication 1747-SO001A-US-P, or for a related product data.
Capacitor Memory Back-up Time VS Temperature
20 25 30 35
(77˚F)
(68˚F) (86˚F) (95˚F)
Temperature °C (°F)
40 45 50 55
(104˚F) (113˚F) (122˚F) (131˚F)
60
(140˚F)