7. Internal Web pages
Issue 06/15 Publication PUB059-002-00 67 of 136
Network Fault : This field shows the type of fault detected that caused the loopback to
Type occur, or an addressing fault on the field units. The types are:
Zero Address - a field unit has been found with an address
of zero.
Address too High xx - a field unit has been found with an address
higher than that set up within the master
station; xx is the address.
Same Address xx - two field units found with the same
address; xx is the address.
Loop Open Circuit - an open-circuit fault found on the loop.
Loop Short Circuit - a short-circuit fault found on the loop.
If two field units are found with the same address, or there is an address
outside the range of addresses expected (as set by No. of Devices on
Network), the network will continue to operate and miss out the faulty field
units.
Loop Baud Rate : Shows the current speed selected. The speed can be 110, 300, 600, 1200,
or 2400 baud.
No. Of FCUs : This is the total number of field units connected to the option module Port A
On Side A and communicating via Port A.
No. Of FCUs : This is the total number of field units connected to the option module Port B
On Side B and communicating via Port B. Port B is only used if there is a loopback
present on the network.
Controls - Available to all user levels
Reset network : Causes the option module to reconfigure the 2-wire network. This should
be used after a loop fault has been corrected.
Network Map
The map shows the order in which the field units have been identified and found by the option
module during the last loop reconfiguration process (reset). Each time the loop is reconfigured
the map is regenerated and repopulated. Any field unit that is not powered-up at the time of
reconfiguration will be absent from the map.
Position : The position in the loop. Number 1 is nearest to Port A.
Address : The address of the field unit.
Failures : Shows a count of communication errors with the field unit. The count has a
range of 0 to 255, after which it rolls around to zero and it increments for
every communication error. The system will only announce a ‘Comms
failure’ when 3 successive tries have failed to locate the field unit. This
counter therefore reflects the communications condition and can be used
as an indicator of the health of the field unit to assess the probability of
failure in the future.
To Next Page
Loading...
