Operation Manual
FT128 Rev 2.4
115
24.6 Display Statistics for COM Loop (H5/A6)
The statistics can be used during commissioning, service, etc.
Number of Polling is the number of polling ("questions") sent out by FT128 to the units
connected on the COM loop.
Parity fault is the received number of parity faults and % parity faults in relation to the
polling.
Number of Bit faults is the received number of bit faults and % bit faults in relation to
polling.
No answer is the received number of answer faults / no answers and % faults in relation
to polling.
Bit length fault is the number of bit length faults and % bit length faults in relation to the
polling.
The number of Parity faults, no. of Bit faults and No answer and Bit length faults must
normally be "0" or as close to "0" as possible. If not, there are some communication
problems that have to be investigated. Check the COM loop connections and the loop
units. Check that the COM loop cable is not placed too close to mains voltage cables, etc.
that might cause communication disturbance / problems.
Note: All values are set to "0" after a restart and/or when you re-connect the COM loop
(via menu H8/S1).
Action Text in display Comments
"Access"
Log on to FT128 as shown
in page 35.
Scroll to menu H5.
Service
ACCEPT? H5
"A"
Calibration of supervised outputs
ACCEPT? A1
Scroll to menu A6
Display statistics for COM loop
ACCEPT? A6
"A" 68
Polling 1234567 Parity 000000 00.0%
No reply 000000 00.0%
Press "" for the second
information window.
""
Bit length 000000 00.0%
No. of bits 000000 00.0%
Press "" for the first
information window.
"Return"
Display statistics for COM loop
ACCEPT? A6
Scroll or press "Return" to
H5.
"Return" Service
ACCEPT? H5
Scroll or press "Return" to
H5.
68
The values are updated continuously.
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