PERCo CT/L-04.2, Assembly And Operation Manual

Page: 39 / 70

Assembly & Operation Manual
3. Malfunctions of the computer (software, databases etc.).
To detect this malfunction, start the command:
ping x.x.x.x
where
x.x.x.x
is the IP-address of the controller.
If there is a communication, you will see lines similar to the following:
Reply from x.x.x.x: bytes=32 time<10ms TTL=128
If there is no communication (response), check routing Settings of your network.
4. Malfunctions of equipment of Ethernet network , installed between the computer
and the controller: hub, switch and other network equipment including communication
cables.
To detect this malfunction, start the command:
ping x.x.x.x -l 576
where
x.x.x.x
is the IP-address of the controller.
If there is a communication and standard minimal packets (576 bytes) are not
fragmented, you will see lines similar to the following:
Reply from x.x.x.x: bytes=576 time<10ms TTL=128
In such case IP-packets are not fragmented to the size less than 576 bytes and the
selected connection should be operative.
If the positive answer is not received, the problem might be with network switching
equipment that fragments IP-packets to the size less than 576 bytes. Check settings of
this equipment, enlarge the size of
MTU . This parameter is usually specified as
MaxMTU or IPMTU .
5. If several variants of switching are possible , use command:
ping x.x.x.x -l 576 -t
By switching with various variants, look at response time and choose the connection
with the fastest response.
6. Malfunctions of the controller. Failure of elements providing connection via Ethernet
interface (IEEE 802.3) .
To detect this malfunction, have a look at two indicators, installed 8P8C ( RJ45)
connector of Ethernet connection:

LINK – connection:
o
Green light is on – the controller detects connection to Ethernet network,
o
Green light is off – the controller does not detect connection to Ethernet
network;

ACT – data exchange
o
Yellow light is blinking – the controller detects data exchange via Ethernet
network,
o
Yellow light is off – the controller does not detect data exchange via Ethernet
network.
If the controller does not detect connection to Ethernet network (light indicators are off),
connect it to the cable that connects the other controller or computer.
If the controller still does not detect connection to
Ethernet network or the communication
is not reestablished, contact PERCo service in order to repair this controller.
38