ABB REC650 Commissioning Manual page 30

Section 3
Starting up
22
local HMI path Main menu/Configuration/Communication/TCP-IP
configuration/1:ETHLAN1 and Rear OEM - port CD.
The front and rear port IP addresses cannot belong to the same
subnet or communication will fail. It is recommended to change the
IP address of the front port, if the front and rear port are set to the
same subnet.
Setting up the PC or workstation for point-to-point access to IEDs
front port
A special cable is needed to connect two physical Ethernet interfaces together
without a hub, router, bridge or switch in between. The Tx and Rx signal wires
must be crossed in the cable to connect Tx with Rx on the other side and vice
versa. These cables are known as null-modem cables or cross-wired cables. The
maximum length should be about 2 m. The connector type is RJ-45.
IED
IEC09000096 V1 EN
Figure 2: Point-to-point link between IED and PCM600 using a null-modem
cable
The following description is an example valid for standard PCs using Microsoft
Windows operating system. The example is taken from a Laptop with one Ethernet
interface.
Administrator rights are requested to change the PC communication
setup. Some PCs have the feature to automatically detect that Tx
signals from the IED are received on the Tx pin on the PC. Thus
straight (standard) Ethernet cable can be used.
When a computer is connected to the IED and the setting DHCPServer is set to On
via the local HMI path Main menu/Configuration/Communication/TCP-IP
configuration/1:ETHFRNT/DHCPServer, the IEDs DHCP server for the front
port assigns an IP address for the computer. The computer must be configured to
obtain its IP address automatically as described in the following procedure.
1. Select Network Connections in the PC.
RJ-45
PCM600
Tx Tx
Rx Rx
1MRK 511 248-UEN -
IEC09000096-1-en.vsd
Commissioning Manual