14
CC Streams
This chapter provides information about the BC840-MC's contact closure (CC) channels, CC
status, and alarms.
In This Chapter
14.1
CC channels, CC status, and alarms
CC Streams page
CC channels
The contact closure channels of the BC840-MC, each capable of transmitting three copies per
signal, are independent and their transmitters and receivers can also be used separately. It is
possible to send a CC-signal from a CC 1 interface to a CC 2 and vice versa.
CC status
The receiver relays are normally open (fail-safe). Each CC input is sampled 100 times per
second. Changes are transmitted directly, so overall latency of the contact closure signals is
<20 ms. To confirm, the actual contact closure status is transmitted every 100 ms; there is
no further forward error correction on these signals.
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