
10. MAINTENANCE AND INSPECTION
10 - 4
MELSEC-A
10.3
Replacement of Battery
M9006 or M9007 turns ON when the voltage of the battery for program backup and
power interruption compensation falls.
Even if this special relay turns ON, the contents of the program and the power
interruption compensation function are not lost immediately.
However, if the ON state is overlooked, the PLC data contents may be lost.
Special auxiliary relays M9006 and M9007 are switched ON to indicate that the
battery has reached the life time (minimum) indicated in Table 10.3 and it must be
replaced if continued use of the power interruption RAM and /or data backup is
required.
The following sections give the battery service life and the battery changing
procedure.
10.3.1
Service life of battery
Table 10.3 shows the service life of the battery.
Table 10.3 Battery life
Battery life
Battery life (Total power interruption time) [Hr]
CPU model
Guaranteed value
(MIN)
Actual service
value (TYP)
After M9006 or
M9007 is turned ON
A1SJHCPU(S8)
A1SHCPU
A2SHCPU
4000
20000
100
A2SHCPU-S1
2200
12000
56
*
The actual service value indicates a typical life time and the guaranteed value
indicates the minimum life time.
Preventive maintenance is as follows :
(1)
Even if the total power interruption time is less than the guaranteed value in
the above table, change the battery after four to five years.
(2)
When the total power interruption time has exceeded the guaranteed value in
the table above and M9006 has turned ON, change the battery.
Содержание A1SH
Страница 15: ...MEMO...