Rockwell Automation 1757-FFLDC4 FOUNDATION Fieldbus System User Manual - Manual (Page 102)

102 Rockwell Automation Publication 1757-UM012A-EN-P - July 2011
Chapter 6 Logix Block Operation in a ControlLogix System
Use RSLogix 5000 and
RSNetWorx Software The I/O configuration portion of the RSLogix 5000 software generates the
configuration data for each I/O module in the control system, whether the
module is located in a local or remote chassis. A remote chassis, also known as
networked, contains the I/O module but not the module’s owner-controller. A
remote chassis can be connected to the controller by an EtherNet/IP network
(1757-FFLD linking device).
RSLogix 5000 configuration data is transferred to the controller during the
program download and subsequently transferred to the appropriate I/O modules.
I/O modules in the local chassis, and modules in a remote chassis connected
through the EtherNet/IP network (1757-FFLD linking device), are ready to run
as soon as the configuration data has been downloaded.
RSNetWorx software must be run to program the 1757-FFLDC linking device
for scheduled transmissions on the ControlNet network. The software
establishes the connection to the Logix Block to communicate with the owner-
controller.
Even for unscheduled connections, you must run RSNetWorx software initially
to set the network parameters (NUT, SMAX, and UMAX). You do not have to
run the software for each additional unscheduled Logix Block.
See the ControlNet Modules in Logix5000 Control Systems User Manual,
publication
CNET-UM001 , for more information.
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 data references. Logix
Block modules use direct connections only.
When module configuration data is downloaded to an owner-controller, the
controller attempts to establish a direct connection to each of the modules the
data references.
If a controller has configuration data referencing a slot in the control system, the
controller periodically checks for the presence of a module there. When a
module’s presence is first detected, the controller automatically sends the
configuration data and one of the following events occurs:
• If the data is appropriate to the module found in the slot, a connection is
made and operation begins.
IMPORTANT The ‘Major Fault on Controller If Connection Fails While In Run Mode’
checkbox is on the Connection tab of the Module Properties dialog box. If
this box is checked while adding Logix Blocks online in RSLogix 5000
software it may result in faulting the controller if the Logix Block has not
already been downloaded via RSFieldbus software or the Logix Block is
configured to use a scheduled connection.