User manual

Publication 1768-UM001C-EN-P - November 2007
48 Manage Controller Communication
Calculating Connection Use
The total connection requirements for a 1768 CompactLogix system include
both local and remote (distributed) connections. You do not have to tally local
controller connections because the controllers support all of the connections
required for the maximum number of I/O modules and 1769-SDN modules
in one system.
Tallying Remote Connection Use
Remote Connection Type Device
Quantity
Connections
per Device
Total
Connections
Remote EtherNet/IP communication module
I/O configured as direct connection (none)
I/O configured as rack-optimized connection
0 or
1
Remote I/O module over an EtherNet/IP network (direct connection) 1
Produced tag
Each consumer
1
1
Consumed tag 1
Message (depending on type) 1
Block-transfer message 1
Total