Maintenance • Servicing
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ETAL210.1050-1 user's manual V1.00
Chapter 7 • Maintenance
The following chapter describes the maintenance work that can be carried out by a qualified and trained end user.
Information:
Only components approved by B&R are permitted to be used for maintenance work.
1 Servicing
Easy maintenance
The CPU is fanless and can be used across the full temperature range of the X20 system. The built-in battery for
SRAM data retention can be exchanged during operation as long as this is permitted by local regulations. If the
battery is exchanged in a voltage-free state, SRAM data will be retained for approximately 1 minute.
Battery monitoring
The battery voltage is checked cyclically. The cyclic load test of the battery does not considerably shorten its service
life; instead, it gives an early warning of weakened buffer capacity. Status information "Battery OK" is available to
the user via system library function "BatteryInfo" and the I/O mapping of the CPU.
Replacement interval for battery
The battery should be replaced every 4 years. The replacement intervals recommended by B&R reflect the batter-
ies' average service life and operating conditions. They do not correspond to the maximum buffer duration!
The CPUs are equipped with a lithium battery. The lithium battery is located in a separate compartment and pro-
tected by a cover.
Backup battery data
Order number
4A0006.00-000
0AC201.91
1 pcs.
4 pcs.
Short description
Lithium battery, 3 V / 950 mAh, button cell
Storage temperature
-40 to 85°C
Storage time
Max. 3 years at 30°C
Relative humidity
0 to 95%( non-condensing)
Important information about the battery exchange
The product design allows the battery to be changed when the PLC is in a voltage-free state as well as when the
PLC is switched on. In some countries, safety regulations do not allow batteries to be changed while the module
is switched on. To prevent data loss, the battery must be changed within 1 min in a voltage-free state.
Warning!
The battery is only permitted to be replaced by a Renata CR2477N battery. The use of another battery
may present a fire or explosion hazard.
The battery can explode if handled improperly. Do not recharge, disassemble or dispose of the battery
in fire.
1. Perform electrostatic discharge at the top-hat rail or at the ground connection (do not reach into the power
supply unit!)
2. Remove the cover for the lithium battery. Do this by sliding it down and away from the CPU.
