PET-AR400 User Manual
V1.0.0
P.66
B.
Troubleshooting
A number of common problems are easy to diagnose and fix if you know the cause.
Symptom/Problem
Possible cause
Solution
Cannot communicate via the
Ethernet port, but the module
is still working.
The IP/Mask/Gateway
address isn’t within the IP
address range of the LAN.
Change the IP/Mask/Gateway
address to match the LAN, or
ask the MIS administrator for
assistance.
The IP address has
restricted by the IP filter
settings.
Check the IP filter setting using
the Web configuration.
There are more than 30
TCP/IP connections.
Reboot the module.
Able to explore the web page
through port 80 using a web
browser, but Modbus/TCP
program cannot access the
module through port 502.
Port 502 has been
restricted by the firewall.
Consult your MIS administrator
for assistance.
Modbus/TCP program can
access the module through
port 502, but Web browser
cannot explore the web page
through port 80 using a web
browser.
The Port 80 has restricted
by the firewall.
Consult your MIS administrator
for assistance.
The Web Configuration
function has been disabled.
(Shown on the Basic
Settings page)
Enable the Web Configuration
function using either the SMMI
or the console.
The Web server TCP port
has been changed from
port 80 (Shown on the Basic
Settings page)
Change the TCP port to 80 or
reconnect the PET-7H24M using
the specific TCP port.
