GE PACSystems RX7i Reference Manual page 73

Chapter 2. CPU Features & Specifications
Serial Ports CPE330
CPE330 is not equipped with a serial port. Use the embedded Ethernet ports for all communications with
the CPU; use IC695CMM002 or IC695CMM004 modules for serial communications.
Ethernet Ports CPE330
CPE330 supports two independent 10/100/1000 Ethernet Local Area Networks (LANs).
•
LAN1 connects to the uppermost RJ45 connector (Figure 18). It is not switched.
•
LAN2 connects to the two lower RJ45 connectors. They are switched internally.
Space is provided beside each connector (Figure 18) to record the IP address used on each LAN.
Each of the embedded Ethernet interfaces automatically senses the data rate (10 Mbps or 100 Mbps or
1 Gbps), communications mode (half-duplex or full-duplex), and cabling arrangement (straight-through
or crossover) of the attached link.
Any of the embedded Ethernet ports may be used to communicate with the Proficy Machine Edition
(PME) programming and configuration software using the Service Request Transport Protocol (SRTP, a
proprietary GE protocol, used primarily for communication with the programmer).
For default IP Address and other details, refer to Establishing Initial Ethernet Communications, Section
3.4.1.
Ethernet Network Configuration CPE330
The user must be careful when assigning IP Addresses and Subnet Masks for CPE330:
•
Each LAN supports a unique IP Address
•
LAN1 and LAN2 interfaces should not be configured for the same network.
By default, PME prohibits configuring both LAN interfaces on an overlapping IP subnet.
Care must also be taken when assigning IP Addresses and subnet masks to each LAN so that each
network does not overlap any remote subnets in the network infrastructure:
•
Subnets overlap with one another when the subnet portions of the IP Addresses are not
completely unique
•
Overlapping subnets may result in intermittent Ethernet communications, or none. This would
be due to packets being routed to the wrong LAN.
•
Duplicate IP Addresses may also result in intermittent Ethernet communications, or none. This
is due to collisions on the LAN induced by two devices with the same IP Addresses
communicating at the same time.
Ethernet Gateway Operation CPE330
The CPE330 allows configuration of an Ethernet gateway on both LAN1 and LAN2. Since the CPE330
contains two LAN interfaces, each one supporting a unique IP Address, only one gateway is active at a
time.
•
Whenever a gateway is configured on only one of the two LAN interfaces and the other is not
configured (0.0.0.0), the single gateway is shared by both interfaces;
•
Whenever a gateway is configured on both LAN interfaces, the LAN1 gateway is given priority
over the LAN2 gateway if LAN1 is functional. For example, in the event the LAN1 cable is
disconnected, the CPE330 will use the LAN2 gateway as a backup.
PROFINET Controller
An Embedded PROFINET Controller may be configured on LAN2. For additional details, refer to Section
2.1.6, Embedded PROFINET Controller.
62 PACSystems* RX7i, RX3i and RSTi-EP CPU Reference Manual GFK-2222AD