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Publication S177E V2.0 Issue 12/04
8.7.4
Loop Diagnostic Display
Reason for loop configuration
Loop: Fault Found
Fault Found
Loop open circuit
Address of fault details
Loopbacks at 4 5
FCU map/Test/Address fault
1>Map 2>Test 3>Addr
This screen provides information to aid in commissioning and fault finding on the current loop.
Additional screens below this one also contain useful data on the loop status and connected field
units.
The first line gives the Reason message and shows the reason why the loop was last re-configured.
The message will be one of the following:
Power on Reset
- loop configured because the master station powered up
Fault Found
- fault detected on the loop whilst it was running without loopbacks
present
Fault Found A
- fault detected on the A side of broken loop whilst running with
loopbacks on
Fault Found B
- fault detected on the B side of broken loop whilst running with
loopbacks on
Reset Command
- loop Reconfigure command entered from keypad or serial port
Return wire fault
- fault detected in the return current path whilst the loop was running
at double speed
Doubling failed
- fault detected after loop assumed double speed.
If a fault occurs, the Fault Found message will be one of the following:
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 setup
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 a fault occurs the message on the third line will be:
Position xx
- xx is the position from A of zero address or address too high
Positions xx yy
- xx and yy are the positions from A of the duplicate addresses
Loopbacks at xx yy
- cable fault lies between xx and yy
If there are no loop faults then lines 2 and 3 will be blank. If there is more than one loop fault the
display shows the first one detected.
Note: In the case of address faults, the master station will continue to operate the loop,
missing out the faulty field units. The fault details can be found with command 3.
