Mitsubishi Electric FR-F820-00077 Instruction Manual page 698

(N) Operation via communication and its settings
Keepalive time (Pr. 1455)
An alive check message (KeepAlive ACK) is sent to a device if the device does not return any response
within the time set in Pr. 1455 "Keepalive time" while a TCP connection is established. When no re-
sponse is returned after the third transmission, the connection will be forced to be closed.
Fig. 5-250:
Ethernet IP filtering function (Pr. 1442 to Pr. 1448)
● Set the IP address range for connectable network devices (Pr. 1442 to Pr. 1448) to limit the
connectable devices. The IP address setting range depends on the settings in Pr. 1443 and Pr. 1446,
Pr. 1444 and Pr. 1447, and Pr. 1445 and Pr. 1448.
(Either of the settings can be larger than the other in Pr. 1443 and Pr. 1446, Pr. 1444 and Pr. 1447,
and Pr. 1445 and Pr. 1448.)
Example Setting example 1:
In this case, the IP address range in which Ethernet communication is permitted is "192.168.x (1 to
3).xxx (100 to 150)".
Ethernet IP address for
Filtering range setting for
the Ethernet IP address
Fig. 5-251:
5 - 526
Inverter
Time set in
Pr. 1455
Time set in
Pr. 1455
Time set in
Pr. 1455
Time set in
Pr. 1455
Timeout (connection close)
Time
Process of Keepalive checking
Pr. 1442
192
filtering
The range is between the
values set in both
Ethernet IP filtering function setting example 1
Connected device
Normal communication
KeepAlive ACK (first)
KeepAlive ACK (second)
KeepAlive ACK (third)
Pr. 1443 Pr. 1444
168 1
parameters.
Pr. 1446 Pr. 1447
9999 3
Parameters
No response
No response
No response
Pr. 1445
100
The range is between the
values set in both
parameters.
Pr. 1448
150
I003109E
I003110A