Eaton easy800, Руководство пользователя

Страница: 342 / 394

11 What Happens If …?
11.5 Functionality of the NET faulty
338
Control Relay easy800 11/11 MN04902001Z-EN www.eaton.com
11.5.1 Monitoring via diagnostics bits
Diagnostic bits ID01 - ID08 (
￫
section 9.6, “

800 standard expanding”,
page 325) provide information on the presence or absence of NET stations.
The state of the diagnostic bits is defined by the reception of a sign of life
signal that every NET station sends.
If the sign of life signal of a configured NET station is no longer received, the
diagnostics bit ID01 -ID08 for the missing NET station is immediately set to 1
for all remaining stations.
The sign of life signal is sent cyclically depending on the baud rate.
The presence of the configured NET stations is evaluated at the following
time intervalls:
If, for example, the station with NET ID 7 is missing, the diagnostics bit ID7
changes to 1 on every remaining NET station. The missing station is also
indicated by means of a permanent light on the LED NET for all remaining
NET stations.
Example of scanning the diagnostics bit ID..
Figure 221:Scanning the diagnostics bit in the circuit diagram
= Visible area
Baud Rate Station must send a “sign of life” every ... Station detects a missing sign of life
signal from …
[Kbit/s] [ms] [ms]
1000 60 180
500 60 180
250 120 360
125 240 720
50 600 1800
20 1500 4500
10 3000 9000
CAUTION
In order to ensure that a circuit diagram with NET operands
(e.g. 3GT01) is always working with the latest data, you should
query the diagnostics bit ID.. of the sending NET station (see
following example) before evaluating the operands.
If you do not evaluate the appropriate diagnostics bit, this may
cause malfunctions in your application.
ID03----------------------------- Ä :01
GT03Q1-------------------------DB16T_
....
:01....