Allen-Bradley MicroLogix 1761-NET-ENI, Руководство пользователя

Страница: 46 / 102

Publication 1761-UM006A-EN-P - February 2001
5-2 Peer-to-Peer Messaging
The table below illustrates the relationship between messages and
their corresponding configuration addresses.
If the ENI receives a PCCC read message to any of its configuration
addresses (nodes 100 to 149), the ENI responds with the current
configuration of that node/address.
Using the configuration shown in Table 5-2; if the controller initiates a
read or write message to node 0, the ENI forwards the request to the
TCP/IP address at Node 100 (111.222.233.200).
Table 5.1 Message Routing
ENI receives read or
write PCCC message to ENI TCP/IP route
configuration Message forwarded to destination
node TCP/IP address
Node 0 Node100 111.222.233.200 (stored at Node 100)
Node 1 Node101 111.222.233.201 (stored at Node 101)
IMPORTANT
When the ENI receives a PCCC write message to a
configuration node address (100 through 149), it
closes any open communications currently active on
that connection and reconfigures the IP address to
match the new configuration.
If the received data matches the current
configuration, the ENI closes any open
communications with the destination device.