P3 - Pakscan Master Station Technical Manual
66 of 136 Publication PUB059-002-00 Issue 06/15
Network Diagnostics
No. Of Devices : This is the number of field units that are expected to be located on the
On Network network. It is the highest address that the network will scan up to when
locating field units. All field units need to be consecutively addressed, and
there should be no gaps in the addresses.
No. Of FCUs : This is the total number of field units located on the network. If all the field
Found units are powered on and connected, then the number will equal the No. Of
Devices On The Network above.
Configuration : This field shows any fault that exists on the network cabling and the stages
Status passed through as network configuration takes place.
During configuration the following sequence can be displayed -
1. Wait for Loopbacks 1 (first wait for loopbacks to come on)
2. Find FCUs on Port A (finding FCUs on port A)
3. Test Loop (testing for complete loop)
4. Find FCUs on Port B (finding FCUs on port B)
5. Wait for Loopbacks 2 (second wait for loopbacks to come on)
6. Loopbacks off on A (removing loopbacks from port A)
7. Loopbacks off on B (removing loopbacks from port B)
(The normal sequence for a fault-free loop would be 1, 2 and 3. A
sequence for a break in the loop, anywhere except at port A or port B,
would be 1 to 7. Some of the phases may be very quick, particularly at
higher baud rates, and so may not be seen on the browser display.
Whilst the configuration is taking place, the master station web page shows
‘Loopback in Progress’ and a blue light on the Option module.
If the configuration process detects a fault on the loop and switches on the
loopback circuits of two field units, the master station web page shows
‘Loopback in Use’ and illuminates the yellow light.
Last Network : The loop can be reconfigured for a number of reasons and this field will
Reset Initiated show the cause of the last reset/reconfigure that occurred.
By The possible reasons are:
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.
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