5. Configuration
5.3. Free VCR Recommendation
R400 Experion PKS Series A Fieldbus Interface Module User's Guide 119
July 2010 Honeywell
F
OUNDATION Fieldbus and the Experion configuration and support
role for F
OUNDATION Fieldbus should use non-Experion interfaces
with devices in an Experion system.
Never connect non-Experion interfaces while commissioning
devices and/or loading (or reloading) Control Modules containing
Fieldbus function blocks.
Never make any parameter changes without the knowledge and
cooperation of plant/mill operations personnel.
Never use non-Experion interfaces to load or commission
devices.
Always connect non-Experion Interfaces to the network as visitor
only at one of these four addresses: 252, 253, 254, or 255.
Always connect non-Experion Interface to the network as Basic
Device Type. Never connect as Link Master Type.
You can use any spare connection terminal on the bus to connect
non-Experion interfaces; but you must make sure that the
connection is secure or it could disrupt link communications.
Carefully consider the need for using a non-Experion interface in
the field, since most of them are very SLOW in comparison to
Experion operations.
Be aware that non-Experion interfaces can use significant
bandwidth that could affect Experion performance.
Always remove non-Experion interfaces from the network when
their intended task is completed.
5.3 Free VCR Recommendation
We recommend that you leave at least one VCR free during configuration so that device
replacement will not require you to free a VCR first. Each Fieldbus segment requires at
least one free VCR to support reloading or replacing a device on the segment. If you
configure each segment with the maximum number of VCRs allowed, 64 per segment for
Series A FIM, you will need to free a VCR before you can complete a device
replacement on the given segment. Typically, you can free a VCR by deleting a Control
Module or device from the Monitoring tab in Control Builder. Control Builder displays a
Warning message when a segment is low on free VCRs.
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