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MELSEC-F
SPECIFICATIONS3
3 - 23
(i) Connection status storage area (BFM #20480 to 22639)
BFM number
Attribute Application Name
Initial value
Decimal
(Hexadecimal)
Flash ROM
save
Reference
section
Decimal
(Hexadecimal)
20480
(5000
H)
R
Connection
status storage
area
Connection
status
information area
Open complete signal
0: Open incomplete
1: Open completed
• Connection No. 1 (b0)
• Connection No. 2 (b1)
• Connection No. 3 (b2)
• Connection No. 4 (b3)
TCP : 1 by connection establishment
UDP : 1 by communication enabled
0
(0
H)
Section 5.6
20481
(5001
H)
— System area — — —
20482
(5002
H)
R
Open request signal
0: No open request
1: Open being requested
• Connection No. 1 (b0)
• Connection No. 2 (b1)
• Connection No. 3 (b2)
• Connection No. 4 (b3)
TCP Passive: 1 by listen
Active : 1 by open process
UDP : 1 by communication enabled
0
(0
H)
Section 5.6
20483 to 20484
(5003 to 5004
H)
— System area — — —
20485
(5005
H)
R
Fixed buffer
information area
Fixed buffer reception status signal
0: Data not received
1: Data being received
• Connection No. 1 (b0)
• Connection No. 2 (b1)
0
(0
H)
Chapter 7
20486 to 20504
(5006 to 5018
H)
—System area ———
20505 to 20506
(5019 to 501A
H)
R/W
System port
information area
DNS server 1 IP address
0
(0H)
Section
10.6
20507 to 20508
(501B to 501C
H)
R/W DNS server 2 IP address
0
(0
H)
Section
10.6
20509 to 20510
(501D to 501E
H)
R/W DNS server 3 IP address
0
(0
H)
Section
10.6
20511 to 20512
(501F to 0520
H)
R/W DNS server 4 IP address
0
(0H)
Section
10.6
20513 to 20591
(5021 to 506F
H)
— System area — — —
20592 to 20994
(5070 to 5202
H)
—System area ———
20995
(5203
H)
R/W
"Interrupt
detection"
status storage
area
Interrupt detection count
0
(0
H)
—
20996 to 22639
(5204 to 586F
H
)
—System area ———