Publication 1756-UM001G-EN-P - January 2007
Maintain the Battery
127
Estimate Warning Time
Use this table to estimate the battery life after the low-battery warning
(BAT LED = solid red). Use these times whether or not the controller
has power. There is always a small drain on the battery.
IMPORTANT
When you power up the controller, see if there is a low-battery warning. If you get a
low-battery warning for the first time, you have less battery life than this table
shows. While powered down, the controller still drains the battery but it cannot give
the low-battery warning.
Temperature 2.54 cm.
(1 in.) Below the
Chassis, Max
Power Cycles
Battery Life After the BAT LED Turns Red (Worst Case)
Project Size
1 MB
2 MB
4 MB
8 MB
16 MB
0...20 °C (32...68 °F)
3 per day
26 weeks
18 weeks
12 weeks
9 weeks
5 weeks
1 per Day
26 weeks
26 weeks
26 weeks
22 weeks
13 weeks
1 per Month
26 weeks
26 weeks
26 weeks
26 weeks
26 weeks
21...40 °C (69.8...104 °F)
3 per day
18 weeks
14 weeks
10 weeks
8 weeks
5 weeks
1 per Day
24 weeks
21 weeks
18 weeks
16 weeks
11 weeks
1 per Month
26 weeks
26 weeks
26 weeks
26 weeks
26 weeks
41...45 °C (105.8...113 °F) 3 per day
12 weeks
10 weeks
7 weeks
6 weeks
4 weeks
1 per Day
15 weeks
14 weeks
12 weeks
11 weeks
8 weeks
1 per Month
17 weeks
17 weeks
17 weeks
17 weeks
16 weeks
46...50 °C (114.8...122 °F) 3 per day
10 weeks
8 weeks
6 weeks
6 weeks
3 weeks
1 per Day
12 weeks
11 weeks
10 weeks
9 weeks
7 weeks
1 per Month
12 weeks
12 weeks
12 weeks
12 weeks
12 weeks
51...55 °C (123.8...131 °F) 3 per day
7 weeks
6 weeks
5 weeks
4 weeks
3 weeks
1 per Day
8 weeks
8 weeks
7 weeks
7 weeks
5 weeks
1 per Month
8 weeks
8 weeks
8 weeks
8 weeks
8 weeks
56...60 °C (132.8...140 °F) 3 per day
5 weeks
5 weeks
4 weeks
4 weeks
2 weeks
1 per Day
6 weeks
6 weeks
5 weeks
5 weeks
4 weeks
1 per Month
6 weeks
6 weeks
6 weeks
6 weeks
6 weeks
EXAMPLE
Under these conditions the battery will last at least 20 months before the BAT light turns red.
•
The maximum temperature 2.54 cm. (1 in.) below the chassis = 45 ºC (113 °F)
•
You cycle power to the controller 3 times per day.
•
The controller contains an 8 MB project.
Summary of Contents for controllogix 1756-L55M12
Page 4: ...Publication 1756 UM001G EN P January 2007 Summary of Changes 4 Notes...
Page 10: ...Publication 1756 UM001G EN P January 2007 10 Notes...
Page 66: ...Publication 1756 UM001G EN P January 2007 66 Place Configure and Monitor I O Modules Notes...
Page 82: ...Publication 1756 UM001G EN P January 2007 82 Develop Applications Notes...
Page 122: ...Publication 1756 UM001G EN P January 2007 122 Maintain Nonvolatile Memory Notes...
Page 130: ...Publication 1756 UM001G EN P January 2007 130 Maintain the Battery Notes...
Page 134: ...Publication 1756 UM001G EN P January 2007 134 LED Indicators Notes...
