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Dual full duplex configuration uses four line driver/receiver modules and
two chassis (figure 4). One data link handles communications while the
other provides handshaking for communications integrity.
Allen-Bradley recommends dual full duplex configuration to ensure
communication integrity between the PLC-2 family processor and the
industrial terminal. Communication integrity is essential if forcing
functions are entered through the industrial terminal and are not cleared
from the terminal before it is turned off. They will remain active until the
line driver/receiver power supply is de-energized.
You will need the following items to install a dual full duplex data link
(figure 4).
Two line driver/receivers, each consisting of:
- one two-slot chassis with two integral 1770-P1 power supplies
- two 1772-DR modules
- two 15-pin, female, D-shell, solder-cup 1770-XE connectors
Two I/O interconnect cables (cat. no. 1778-CR) or Belden 8723, 5000
feet maximum length
Two cables (cat. no. 1770-CW1 and cat. no. 1770-CW2) with three
15-pin, male, D-shell connectors with straight connector hoods (figure
5)
5
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