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Publication S130E
Issue 1.0
Pakscan IIS Technical Manual
8.4.4 FCU Map and Failure Counts
The screen displays the order in which field units have been found on the loop during loop configuration.
The
top line
shows the physical position on the loop, the
second line
the address of the field unit found at that
position, and the third line the master station port it is attached to. For a complete loop with no loopbacks, all
the field units are attached to port A.
The
third line
also shows a count of communication errors with the field unit whose address is displayed
above. The count has a range of 0 to 255, after which it rolls around to zero. This count increments for every
communication error though 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 condition of the field unit before it actually may fail completely.
The
bottom line
shows some details about the field unit. "Type" can be displayed as:
Act - Non - IQ Actuator
IQ - IQ Actuator
GP - General Purpose Field Unit
The software version of the EPROM in the field unit is also displayed on this line.
Information for this screen is available approximately 30 seconds after loop configuration is complete and is
upgraded approximately once a minute after that.
The example screen above shows that at loop position 10 there is field unit address 15, and it is attached to
port A , that it is an actuator field unit with software version 2.4 and that 5 communications failures have been
recorded for it since the system was last reset.
Commands available:
- Move to the next field unit
- Move back to previous field unit
- Return to previous menu
Physical position
Loop position = 10
Address
FCU address = 15
Attached port
Port=A Fails= 5
Comms fail count
Field unit type
Type=Act S/W= 2.4
Software version
MENU
