User manual

Embedded Web Pages
298
33002479 06 07/2008
I/O Scanning
Page
General diagnostics for the I/O scanning service are shown at the top of this page:
z the I/O scanning status
z the number of transactions per second
z the number of connections
A value of NOK in the I/O Scanning Status field indicates that the local system is
not scanning. In this case, any data that appears in the Scanned Device Status
display is meaningless.
A value of OK in the I/O Scanning Status field indicates that the values in the
Scanned Device Status display are reporting the state of scanned devices.
In the Scanned Device Status display, the colors that appear in each block indicate
the following states for specific remote devices:
z Green indicates that a device is being scanned
z Black indicates that I/O scanning of the specific device has been intentionally
disabled via the Device Control Block
z White indicates an unconfigured device
z Red indicates a faulty device
Note: Be aware that the green Scanning indicator may incorrectly remain green
for a remote scanned device after the Ethernet cable gets removed from that
device. This inaccurate indication occurs when the health timeout value in the I/O
Scanning configuration screen is set to 0 (see Configuration Parameters, p. 209).
You should configure an operational health timeout value in the range 1...65535 (in
1 ms increments). If the health timeout value is set to any value in this range, the
Scanning indicator reports I/O scanning health correctly.
I/O SCANNING DIAGNOSTICS
I/O Scanning Status: NOK
Number of transactions per sec.: 0 | Number of connections: 0
SCANNED DEVICE STATUS
1
17
33
49
16
32
48
64
Not configured Scanned Disabled Fault