Yokogawa FieldMate - Manual (Page 377)

<Appendix I How to clear VCR (NI-FBUS only)>
App.-56
IM 01R01A01-01E 9th Edition : May 31, 2013-00
Appendix I How to clear VCR (NI-FBUS
only)
 Outline
Although FieldMate has adopted NI-FBUS communication card of National Instrument for
FOUNDATION fieldbus H1, the communication card itself contains the following glitches.
If the specific operation continues, VCR, FOUNDATION fieldbus H1 communication resources,
may reach the maximum limit (100) eventually communication with FOUNDATION fieldbus H1
device cannont be established thereafter.
Note : the specific operation
After starting NI-FBUS Communications Manager, PC is off or stand-by (not shutdown) and start
again. Then change the FOUNDATION fieldbus H1 segment connection.
If the problem above is encountered, clear VCR of NI-FBUS card by this tool incorporated in
FieldMate.
 VCR (Virtual Communication Relationship)
A Fieldbus device has many VCRs so that it can communicate with various devices or
applications at the same time. It is possible because the VCR guarantees the message goes
to the correct partner without risks of losing information. A VCR is identified by an application
with device-local identifier called “index” specified in Application Layer. It is also identified from
other devices with DL-address specified in Data Link Layer. A VCR has a queue (fast-in, fast-out
memory) or a buffer (memory to store data) to save messages.
It is the responsibility of network configuration to give the correct information of the index and DL-
address as well as other operating information to VCRs through Network Management.
 Screen
App.I01E.ai
It displays the port overview of NI-FBUS
card installed in PC. Max first index No,
used VCR, unused VCR.
Effective in 2 port type
Clear VCR
Exit thetool
Max VCR is displayed. The current NI-
FBUS card always shows 100.
The used VCR is displayed
Max 100.
The first Index No of unused VCR is
displayed.
The port overview of NI-FBUS card is displayed.
NI-FBUS with a port displays one.
Figure App.-I-1 FM NIFBUS Clear