3 Hardware Description
3.5 Digital Input/Output
This function is only available on NetCom Plus 811 DIO. The input signals are optically isolated
from the system, and output function is realized by relay.
3.5.1 Input Connection
Figure 12: Terminal Block
Input
The input uses a wet contact. There are two connector clamps per
input signal, each pair marked by the number from 1 to 8. The symbol
around the numbers represents a push button to connect both clamps
together. The right clamp provides a voltage of roughly 5V at low
current. When this supply is connected to the left clamp, the input
signal changes status. Usually such is done using a push button or a
switch, but a relay output will also do quite fine.
3.5.2 Output Connection
Figure 13: Terminal Block
Output
The output is controlled by a relay, providing three clamps on the
Terminal Block. The center clamp is the common signal, and marked
by the number from 1 to 8. By default (system is off, or output is
set as logic One) the relay connects the common signal to the right
clamped marked with the letter ’Ö’. When the relay is programmed
to logic Zero, the connection to the right clamp is interrupted, instead
the common signal connects to the left clamp marked with the letter
’S’. These relay control either 2 A at 30V DC, or 0.5 A at 125VAC.
3.6 Network
The NetCom Plus and NetCom Plus POE connect to Ethernet, while the NetCom Plus with WLAN
option may use either WLAN or Ethernet at customers choice. By factory settings both interfaces
are enabled, and the priority is set for Ethernet (i.e. via cable). If no cable is connected here, the
Wireless interface is active. Otherwise the server communicates via Ethernet. Both interfaces use
the same MAC Address and IP Address, to allow for seamless switch-over from cable to wireless
operation. The NetCom Plus with WLAN option Servers do not perform a DHCP request when
the WLAN interface becomes active.
3.6.1 Ethernet and LED
The connector for Ethernet is the usual RJ45. Simply connect it to your (switching) Hub. Because
the Gigabit Ethernet has Auto-MDI(X) function, a direct cable or a cross-over cable may both be
used.
When the connect is done the Link LED on NetCom Plus (orange) will light. When data traffic
occurs on the network, this LED will blink. It depends on your network whether a 100/10 Mbit
or a 1000 Mbit connect will be established. A 100/10 Mbit net causes the Speed LED on NetCom
Plus (green) to light, with 1000 Mbit it will remain dark.
September 2016
NetCom Plus User Manual
25
