16
CTI Janus Programmable Automation Controller IOG
operating at 100 Mb full duplex. If connected to a device that does not support the maximum port speed, a port
will auto-negotiate with the device a slower speed (100Mb or 10Mb). All ports can be used for multiple purposes,
such as programming and monitoring, data communications with SCADA workstations and other devices, and
Ethernet based I/O. Duplicate IP Address detection, broadcast/multicast storm protection and traffic rate limiting
are enabled for each port.
By default, Ethernet frames arriving at a port are forwarded only to the controller microprocessor. Ethernet frames
are not forwarded between the ports, preventing the accidental creation of loops. If ports are connected to
different networks, this behavior prevents traffic on a particular network from entering the other networks. To
allow for special situations, forwarding between ports can be enabled in the web server C
ONFIGURATION
/N
ETWORK
S
ETTINGS
Section 4.2.3 Internal Ethernet Switch Configuration
Each Ethernet port connector contains two embedded LEDs. The
L
INK
LED (top) indicates whether the Ethernet
port is successfully connected to another Ethernet device, such as a network switch. The
A
CTIVITY
LED (bottom)
provides visual indication that Ethernet packets are being received or transmitted via the port. See the following
table below for details.
LED
State
Indication
Link
Off
Ethernet link is not available.
On
Ethernet link is available.
Act
(Activity)
Off
No Ethernet frames are being transmitted on the network to
which the port is connected.
On
(Blinking)
Ethernet frames are being transmitted on the network to
which the port is connected
