Emerson Rosemount, Reference Manual

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142
Reference Manual
00809-0100-4021, Rev GC
Section 4: F
OUNDATION
fieldbus Configuration
April 2014
Foundation™ fieldbus configuration
4.3.5 Capabilities
Virtual Communication Relationship (VCRs)
There are 20 VCRs, where one is permanent and 19 are fully configurable by the host system.
Also, thirty link objects are available.
Table 4-1. Network Parameters
Block execution times
4.4 F
OUNDATION
fieldbus function blocks
For reference information on the resource, sensor transducer, AI, LCD display transducer blocks
refer to
“Function blocks” on page 201 . Reference information on the PID block can be found in
the function block manual (Document No. 00809-0100-4783).
Resource block (index number 1000)
The resource function block (RB) contains diagnostic, hardware, and electronics information.
There are no linkable inputs or outputs to the resource block.
Network parameter Value
Slot Time 8
Maximum Response Delay 2
Maximum Inactivity to Claim LAS Delay 32
Minimum Inter DLPDU Delay 8
Time Sync class 4 (1 ms)
Maximum Scheduling Overhead 10
Per CLPDU PhL Overhead 4
Maximum Inter-channel Signal Skew 0
Required Number of Post-transmission-gab-ext Units 0
Required Number of Preamble-extension Units 1
Block Execution time
Resource –
Transducer –
LCD display Block –
Advanced Diagnostics –
Analog Input 1, 2, 3 60 ms
PID 1 and 2 with Autotune 90 ms
Input Selector 65 ms
Signal Characterizer 60 ms
Arithmetic 60 ms
Output Splitter 60 ms