1 FUNCTIONS
1.17 Redundant System Function
227
1
Availability of control system IP address for each function
The following table lists the availability of control system IP address for each function.
: Available, : Restrictions exist, : Not available
■How to use dedicated instructions
The following table lists how to use the control system IP address for dedicated instructions specifying an IP address.
Function Availability Precautions
Connection with MELSOFT products and a GOT • When accessing from MELSOFT products (excluding GX Works3), the control
system IP address can be used. When accessing from GX Works3 and a GOT,
use the IP address of system A or B.
• When system switching occurs during file access, file access is interrupted. When
accessing files, use the IP address of system A or B.
• When system switching occurs due to a timeout or communication error in TCP/IP
communications, the connection needs to be re-opened.
• When the control system IP address is used, neither the write operation nor the
control operation can be performed. Use the IP address of system A or B.
Communications using the SLMP • When system switching occurs during file access, file access is interrupted. When
accessing files, use the IP address of system A or B.
• When system switching occurs due to a timeout or communication error in TCP/IP
communications, the connection needs to be re-opened.
Communications using the predefined protocol • In TCP/IP communications, the control system IP address can be used only when
the Ethernet-equipped module side is set as Passive open. When it is set as Active
open, use the IP address of system A or B.
• In UDP/IP communications, the control system IP address can be used only when
the Ethernet-equipped module receives data.
• When system switching occurs due to a timeout or communication error in TCP/IP
communications, the connection needs to be re-opened.
• When using the protocol used for sending or sending/receiving data, use the IP
address of system A or B.
Socket communications • In TCP/IP communications, the control system IP address can be used only when
the Ethernet-equipped module side is set as Passive open. When it is set as Active
open, use the IP address of system A or B.
• In UDP/IP communications, the control system IP address can be used only when
the Ethernet-equipped module receives data.
• When system switching occurs due to a timeout or communication error in TCP/IP
communications, the connection needs to be re-opened.
Communications using the fixed buffer
Communication using the random access buffer
Communications using a link dedicated instruction For details on dedicated instructions, refer to the following. ( Page 227 How to
use dedicated instructions)
File transfer function (FTP server) When system switching occurs during file access, file access is interrupted. When
accessing files, use the IP address of system A or B.
Time setting function (SNTP client)
Security function When using the remote password, after system switching occurs, the unlock
processing needs to be performed again.
IP address change function
Dedicated instruction Usage methods
GP.CONOPEN Set the external device IP address in the control data for the control system IP address.
SP.SOCOPEN
OPEN
SP.SOCCINF
SP.SOCCSET
READ Set the address specification method for the target station in the control data as the IP address, and set the control
system IP address to the target station.
SREAD
WRITE
SWRITE
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