ABB CL Series Applications Manual page 335

CL-NET network, COM-LINK
serial connection
332
If the absence of a "sign of life" is detected, the respective
diagnostics contact is set to 1.
Diagnostics
contact
ID 01
ID 02
ID 03
ID 04
ID 05
ID 06
ID 07
ID 08
h
If a station does not send a "sign of life" signal
(station not available, CL-NET interrupted), the respective
diagnostics contact ID... is activated.
Attention!
If the states of the inputs, outputs or data are required by
a station without fail, the respective diagnostics contact
should be evaluated and the information applied in
accordance with its respective application.
If the respective diagnostics contacts are not evaluated, it
may cause faults in your application.
h
The data to be read from a faulty station is set to 0 after
the fault is detected.
1SVC 440 795 M1100
Station
number
1
2
3
4
5
6
7
8