User`s guide

Page 23

Controlinc 1746-C (Version 5.21) Network Master Users Guide (2004-11-18)

Notes:

• Though not much, the diagnostic scan time can also vary with the number of valves in the valve

scan time slice.

• The greater the number of valves configured to be on line, the longer the diagnostic scan time

… more valves to check.

• During normal operations, an operator can use the HMI to force the system into a diagnostic

scan by temporarily changing the “scan period” value in table [0] to a value lower than the

current scan loop counter. This will cause the program to enter a diagnostic scan as soon as

this scan loop has finished.

• Because the diagnostic scan detects faulty communication ports and flags them, there can be a

perceived increased performance in the normal network scans because “off-line” actuators have

already been flagged and will be skipped.