Mitsubishi Electric Melsec QJ71LP21 Reference Manual page 393

8 TROUBLESHOOTING
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8) PSU operation status of each station extension (SW008C to 8F)
Displays the supply status of the external power 24 V DC of the network
module.
When the communication status of each station is normal, the display is
effective.
• Normal display
• Highlighted display : 24 V DC powered
9) Each station PLC operation mode status (SW01F4 to 1F7)
Displays the operation mode of the Redundant CPU.
"---" indicates that the CPU is other than the Redundant CPU.
• Backup mode
• Separate mode
: Not powered by 24 V DC or network module without
supply terminal
: Operating in the backup mode
: Operating in the separate mode
MELSEC-Q
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