ABB Advant Controller 80 User Manual page 55

Figure 4-12 Terminal value settings of a DI810 DB element.
Figure 4-13 Terminal value settings of a subordinate element
(DI810_1.11 depicted). Each subordinate element, i.e. input/output
channel, can be given a descriptive instance name by the programmer.
The input/output channel is active when the subordinate terminal ACT
is set to 1 (default setting). If the channel is not active, a connection to
the PC section of the application program cannot be made.
AC 80 User's Manual 4-17