Mitsubishi Electric MELSEC Q Series User Manual page 193

(1) Setting method
For this setting, use the following functions in Setting/monitoring tools for the C Controller module.
•
Project view  "Parameter"  "CCPU Parameter"  <<I/O assignment settings>>
 "Switch Settings"
Set the b1 of the "Switch3" in the slot connected with the C Controller module to "ON".
(Doing this to the other CPU slots, the setting is ignored.)
b15 b14 b13
(2) Precautions
(a) Battery error
During battery less drive, battery error cannot be detected.
During battery less drive, the following settings in Setting/monitoring tools for the C Controller module are ignored.
• Project view  "Parameter"  "CCPU Parameter"  <<RAS settings>>  "Carry Out Battery Check"
( Page 154, Section 11.2)
(b) Battery backup RAM and Standard RAM
For battery less drive, do not use the battery backup RAM and standard RAM.
(c) Clock data
• If the C Controller module in a multiple CPU configuration is No.1,
do not use the battery less drive function.
Otherwise, time in other than No.1 module will be set incorrectly, since the CPU modules other than No.1
are synchronized with time in No.1.
• When the C Controller module in a multiple CPU configuration is No.2 through No.4 modules
The C Controller module clock data are operated with the initialized value (00:00:00, Jan 1, 2000) from the
rising of the C Controller module to the completion of time synchronization with No.1 CPU module.
• When the SNTP function is used
The C Controller module clock data are operated with the initialized value (00:00:00, Jan 1, 2000) from the
rising of the C Controller module to the completion of time synchronization with a SNTP server.
b12 b11 b10 b9 b8 b7
CHAPTER 11 BASIC FUNCTIONS
b6 b5 b4 b3 b2 b1
ON
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b0
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