Mitsubishi Electric MELSEC iQ-R-R6SFM - Internal Relay (M); Latch Relay (L); Link Relay (B); Annunciator (F)

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21 DEVICES
21.3 User Device
Internal relay (M)
This device is used as an auxiliary relay within the CPU module. The following operations turn off all the internal relays.
• Turning power of the CPU module off and on
• Reset
• Latch clear
Latch relay (L)
This device is an auxiliary relay which enables latching (data retention during power failure). This device is used within the
CPU module. This device latches operation results (ON/OFF information) even after the following operations.
• Turning power of the CPU module off and on
• Reset
Link relay (B)
This device is used as a CPU side device when refreshing bit data between the network module, such as the CC-Link IE
Controller Network module and the CPU module.
Refreshing network modules using link relay
Data are transferred/received between the link relay (B) within the CPU module and the link relay (LB) of the network module,
such as the CC-Link IE Controller Network module. The refresh range is specified using parameters on the network module.
The part which is not used for refreshing can be used for other applications.
Annunciator (F)
This device is an internal relay used for a customer-created program which detects malfunction/failure of the equipment.
When the annunciators are turned on, SM62 (Annunciator) is turned on, the number of activated annunciators and their
device numbers are stored in SD62 (Annunciator number) to SD79 (Table of detected annunciator numbers).
Ex.
Failure detection program
Also the number of the annunciator turned on first (the number stored in SD62) is registered in the event history.
Only one annunciator number is registered in the event history while power is turned on.
(1) Outputs the annunciator number of the annunciator that turned on.
(2) ON detection of the annunciator
SD62
BCDP
SM62
SET
F5
K4Y20
X0 X10
SM62
SD62
SD63
SD64
SD65
SD79
0
0
OFF ON
0 5
0 1
0 5
(1)
(2)