Precautions - Mitsubishi Electric MELSEC iQ-R-R00CPU User Manual

Precautions

This section describes precautions on using the latch with the battery-less option cassette.
• When a battery-less option cassette is inserted, the current consumption of the CPU module increases by 0.15A at
maximum.
• Insert or remove a battery-less option cassette while the programmable controller is powered off. If it is inserted or removed
while the programmable controller is powered on, a stop error occurs in the CPU module and data may not be retained.
• Clock data cannot be retained during power failure when no battery is mounted. Therefore, it is recommended to set "Time
Setting (SNTP Client)" in the module parameter. ( MELSEC iQ-R Ethernet User's Manual (Application))
• The scan time during the execution of the latch with a battery-less option cassette is longer than the scan time of when the
latch with a battery-less option cassette is not executed. As for the instructions specifying the data retained during power
failure such as the file register for the arguments, the instruction processing time will be longer. ( Page 898 Processing
Time,  MELSEC iQ-R Programming Manual (CPU Module Instructions, Standard Functions/Function Blocks))
• When the latch with a battery-less option cassette is canceled, the data retained during power failure by using the battery-
less option cassette with latch setting is not taken over.
• The extended SRAM cassette and battery-less option cassette cannot be used together.
23 LATCH FUNCTION
396
23.2 Latch with Battery-less Option Cassette