The transmission duration of the cyclic data transmission depends on the number of AS‑i slaves
and can be up to 1.31 s.
Acyclic CTT2 data transmission
The cyclic CTT2 data transmission can be interrupted by the acyclic data transmission to permit
a precise diagnosis of the individual elements. In this way, function elements with errors and
function elements with prewarnings can be read out.
The acyclic CTT2 data transmission consists of up to 200 bytes of input and output data.
The transmission duration of the acyclic data transmission depends on the number of AS‑i slaves
and can be up to 16 s.
Diagnostics / service
7.6 Diagnosis using AS-Interface (CTT2 protocol)
SIRIUS 3RK3 Modular Safety System
Equipment Manual, 07/2020, NEB926253002000/RS-AC/006 299
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