Ethernet Function - Mitsubishi Electric MELSEC iQ-R Series User Manual

Ethernet function

The following is the list of special relay areas relating to the Ethernet function.
No. Name
SM1520 IP address storage area
write request
SM1521 IP address storage area
write error
SM1522 IP address storage area
clear request
SM1523 IP address storage area
clear error
SM1524 Initial processing
successful completion
state
SM1525 Initial processing error
completion state
*1 This is the memory used by the system when the CPU module is executing functions.
*2 Ethernet function initial processing involves updating parameters set for data communication to Ethernet-equipped modules to enable
communication with external devices. Initial processing of Ethernet-equipped modules is performed by setting Ethernet parameters,
writing them to the CPU module, and then powering off and on or resetting the CPU module. Note that if Ethernet parameters are not
set, initial processing of Ethernet-equipped modules will be performed based on default parameters. (SM1524 (initial processing
successful completion status) turns on the moment initial processing is complete, and communication with external devices becomes
possible.)
APPX
662
Appendix 4 List of Special Relay Areas
Data stored
OffOn: Write request exists
OnOff: Writing completed
Off: No error
On: Error
OffOn: Clear request exists
OnOff: Storage area cleared
Off: No error
On: Error
Off: Completed with an error
On: Completed normally
Off: Completed normally
On: Completed with an error
Details
• When this relay is changed from off to on, IP address
settings stored in SD1518 to SD1525 are written to the IP
address storage area (system memory
module.
• Once write to the IP address storage area (system
*1
memory ) is completed (regardless of whether it was
successful or not), this relay is turned off.
This relay is turned to on when write to the IP address
*1
storage area (system memory ) failed, and off when it was
successful.
When this relay is changed from off to on, the IP address
storage area (system memory) is cleared.
Once clear of the IP address storage area (system
*1
memory ) is completed (regardless of whether it was
successful or not), this relay is turned off.
This relay is turned to on when clear of the IP address
*1
storage area (system memory ) failed, and off when it was
successful.
This relay is turned on when the initial processing for the
Ethernet function was completed successfully.
initial processing was completed with an error, SM1525 is
turned on and SM1524 stays off.
This relay is turned on when the initial processing for the
Ethernet function was completed with an error.
initial processing was completed successfully, SM1524 is
turned on and SM1525 stays off.
Set by (setting
timing)
S (Status change)/
U
*1
) of the CPU
S (Status change)
S (Status change)/
U
S (Status change)
S (Status change)
*2
When the
S (Status change)
*2
When the