cable and terminations are correct but ensures the anticipated number of controllers
match the quantity found. Validate controller addresses and correct any duplicates.
Before using the FIT, the user needs to make sure the bus installation to be tested (FC
or SA) is complete and ready to be validated. This includes the following:
1. Bus cable is installed, and terminated at every controller.
2. MS/TP bus shield is continuous end to end for each bus segment with only one
hard ground per bus segment.
RJ-12 connections, typically for sensors, do not require use of
shielded cable due to distance limitations.
3. EOLs are present at the end of each bus segment.
Not applicable for SAB RJ-12 connections.
4. Power is available for every controller on the bus to be validated.
If no power is available to the controller when the MS/TP bus needs to be tested,
providing temporary power to the controllers to validate bus wiring is an option. If
temporary power to all controllers is not practical, there are two other options:
1. Use two FITs connected at each end of a bus or bus segment if unpowered
repeaters are present. Each FIT would be required to have different addresses
and EOL set if applicable. See System Menu section for more information on
setting addresses and EOL attributes.
2. Use one FIT connected at the end of a bus and temporary power applied to the
last controller on that bus or bus segment if unpowered repeaters are present.
If the FIT is at the end of a bus segment, its EOL attribute should be set to ON.
Testing in these two methods does not ensure addresses are correctly set or detect
every potential controller MS/TP wiring mistake but does validate continuous bus
wiring and end-to-end continuity.
For every installation, it is the installer’s responsibility to use the FIT to confirm:
Procedure
1. A Bus Health reading of four bars or greater for all FC Bus installations.
2. All device addresses are reporting for each FC Bus installation and each address
is correct.
3. A Bus Health reading of four bars or greater on all SA Bus installations.
For most MS/TP installations, a properly installed bus achieves a Bus
Health of eight bars. Anything less than eight bars is normally an indication of
an installation error but could be caused by extremely long cable distances or a
heavily loaded bus.
Note:
Note:
Note:
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