Direct connections – Rockwell Automation 1756-OF8I ControlLogix Eight-channel Isolated Analog I/O Modules User Manual
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Rockwell Automation Publication 1756-UM540A-EN-P - May 2014
Chapter 1
Isolated Analog I/O Module Operation in the ControlLogix System
• Remote chassis
- A chassis that does not contain the module’s owner-
controller but is connected to the local chassis over the EtherNet/IP
network or ControlNet network.
The Logix Designer application transfers configuration data to the controller
during the program download. Subsequently, data is transferred to the I/O
modules in the local and remote chassis.
The I/O module can operate immediately after the project download from the
owner-controller is complete.
Direct Connections
A direct connection is a real-time data transfer link between the controller and
the device that occupies the slot that the configuration references.
When you download module configuration to a controller, the controller
attempts to establish a direct connection to each module referenced by the
configuration.
OK
FORCE SD
RUN
Logix5575
RU
N REM PROG
ANALOG INPUT
ST
FLT
O
K
ST
FLT
O
K
ANALOG OUTPUT
ANALOG INPUT
ST
FLT
O
K
ST
FLT
O
K
ANALOG OUTPUT
ANALOG INPUT
ST
FLT
O
K
Controller
I/O Modules
Local Chassis
Remote Chassis
EtherNet/IP Network
IMPORTANT
ControlLogix isolated analog I/O modules support only direct connections