Rockwell Automation PLC-5 Fieldbus Solutions for Integrated Architecture User Manual - Manual (Page 139)

Publication 1757-UM006A-EN-P - May 2002
Configurating the 1757-FIM 4-53
General load considerations
The following are some general load considerations to keep in mind,
when you are loading fieldbus components. In most cases, the load
dialog box will quickly guide you through the load operations and
will alert you to potential system problems.
Fieldbus Device States
A fieldbus device is unaware of the steps being executed to configure
a network. Its System Management Kernel (SMK) does sense the
completeness of its configuration to determine what services it can
provide. The following table shows the three major states a SMK in a
field device must go through and the associated services for each state
before a device can fully function on the network.
Table 4.B
If you are loading... Consider this...
A FIM. Be sure ALIV does not appear in the LED display on the front of the FIM. If it does, you must first
load the FIM’s personality firmware using the NTOOLS utility supplied with ProcessLogix
Engineering Tools.
A CM that contains only fieldbus
function blocks. We recommend that CMs containing only fieldbus function blocks be assigned and loaded only
to the appropriate FIM LINK. They will only take up unnecessary memory and execution time in
the CPM/CEE.
A CM that contains both ProcessLogix
and fieldbus function blocks. Be sure CMs that contain any ProcessLogix function blocks are assigned and loaded to a CEE.
Control Builder enforces this and will also load the Foundation Fieldbus.
A fieldbus device through a FIM. Be sure the device configuration in Project tab has the proper PD_TAG specified. While you can
load a device to the link from Project, you can not load and commission a device until it is
connected to the link and its PD_TAG and address agree with those specified in Project. Please
see the next two sections Fieldbus device states and Fieldbus device matching rules for more
information.
Table 4.C
SMK State System Management Services
Un-initialized SM_IDENTIFY
SET_PD_TAG (Clear = False)
Initialized SM_IDENTIFY
SET_ADDRESS
SET_PD_TAG (Clear = True)
Operational SM_IDENTIFY
CLEAR_ADDRES
FIND_TAG_QUERY
FIND_TAG_REPLY
FB_START
SMIB_Acess