Each of these modules functions as an anaits eight input channels.
log-to-digital (A/D) converter for signals on each of
The sampled value of the
input level is converted to a 12-bit binary number.
This number is sent, along with binary information
giving various operating conditions and the number of
the channel being read, to the Input Status Table in
Each module contains an eight-to-one analog multiplexer, A/D circuitry, and an opto-isolator, along with
an address decoder and data-bus drivers. There is
also detection circuitry for open-wire, high-limit, and
low-limit conditions, as well as an LED indicator that
displays module status.