3.4.3 Installation of the Battery for the CPU Module
The CPU is shipped with battery installed but with its connector disconnected to prevent dis
-
charging and short circuits. Connect the battery before the CPU is used for the first time.
With all other PLC CPUs the battery is installed at the bottom side.
To connect the battery open the cover of the battery compartment of the CPU. Check that the
battery is loaded correctly. Insert the battery connector into the connector pin at the case.
Make sure that with the CPUs Q02(H), Q06H, Q12(P)H and Q25(P)HCPU the connector is
inserted into the respective holder in the battery cover.
MELSEC System Q Beginners Manual 3 – 15
The MELSEC System Q The CPU Modules
The PLC CPUs of the MELSEC System Q are equipped
with a battery. During interruption of the power supply the
battery can hold the data of the program memory, the
built-in RAM and the clock for several thousand hours.
However, this time depends on the type of CPU.
The battery should be changed every 10 years.
The SRAM memory cards have an own battery
(Q2MEM-BAT) and are therefore independent from the
battery of the CPU.
RESET L.CLR
BAT.
The battery of a Q00J, Q00 and Q01CPU is
mounted behind the upper cover at the CPU
modules front.
Battery
Connector
Front of CPU module
Bottom of CPU module
Connector
Cover
Battery Q6BAT
CPU
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