Rockwell Automation 1756-L6x_L7x ControlLogix System User Manual - Manual (Page 123)

Rockwell Automation Publication 1756-UM001O-EN-P - October 2014 123
Manage Controller Communication Chapter 7
Local Connections
Local connections refer to connections used to communicate between modules
that are housed in the same ControlLogix chassis (that is, the local modules). Use
Table 31 to calculate the number of local connections that are based on the
configuration of your local chassis.
Remote Connections
Use remote connections when the communication module is in a chassis that is
remote from the controller. The number of connections a communication
module supports determines how many remote connections the controller can
access through that module.
Table 31 - Local Chassis Connections
Local Connection To Device Quantity Connections per
Device Total Connections
Local I/O module (a direct connection) 1
1756-M16SE, 1756-M08SE, or 1756-M02AE servo module 3
• 1756-CN2, 1756-CN2R, 1756-CN2RXT ControlNet communication module
• 1756-CNB, 1756-CNBR ControlNet communication module 0
• 1756-EN2F, 1756-EN2T, 1756-EN2TXT, or 1756-EN2TR EtherNet/IP communication module
• 1756-ENBT EtherNet/IP communication module 0
1756-EWEB EtherNet/IP web server module 0
1756-DNB DeviceNet communication module 2
1756-RIO remote I/O communication module (Connection count depends on module configuration
and can be as many as 10 per module.) 1
1756-DHRIO DH+/universal remote I/O communication module
Each adapter that is associated with the module
1
1
1756-DHRIOXT DH+/universal remote I/O communication module
Each adapter that is associated with the module
1
1
1756-DH485 DH-485 communication module 1
Total
Table 32 - Remote Connections
Remote Connection Type Device Quantity Connections per
Device Total Connections
Remote ControlNet communication module
I/O configured as direct connection (none)
I/O configured as rack-optimized connection 0
1
Remote I/O module over a ControlNet network (direct connection) 1
Remote EtherNet/IP communication module
I/O configured as direct connection (none)
I/O configured as rack-optimized connection 0
1
Remote I/O module over a EtherNet/IP network (direct connection) 1
Remote device over a DeviceNet network
(accounted for in rack-optimized connection for local 1756-DNB)
0