DH+/RIO OPTICAL COMMUNICATION MODULES USERS MANUAL
Copyright © 2003 by Phoenix Digital Corporation, All Rights Reserved.
In order to insure that all DH+ and RIO network data transmissions are precisely regenerated and
synchronized on the fiber optic network, as described above, the fiber network must be keyed-up
in advance of each data transmission. During this very brief key-up time Phoenix Digital’s fiber
optic modules insure that no data is lost, and that this time is fully absorbed in the natural message
gaps of the DH+ and RIO data transmissions. Therefore, no additional time delay is experienced
by the network at-large. The total amount of network key-up time required in advance of each
data transmission is determined by the total number of fiber optic modules connected in a continu-
ous bus or ring network configuration.
Network key-up time must be switch or jumper selected on each Phoenix Digital fiber optic
module. See Figure 8 and Tables 16, 18, and 19 for Network Key-Up switch definitions for
standalone, panelmount OCM and 1771 plug-in OCM fiber optic modules. See Figure 13 and
Table 21 for Network Key-Up jumper definitions for 1746 plug-in OLC and 1756 plug-in OCX
fiber optic modules.
(Tables 18, 19, and 21 provide a variety of network key-up settings, as a function or the maxi-
mum number of fiber optic modules on the bus or ring network. Each column heading in these
tables has two sets of numbers. The first is the number of fiber optic modules on the network, and
the second is the maximum distance a DH+ or RIO network may travel at this setting, in both
miles and kilometers. These distance limitations assume worst case network set-up times re-
quired only for older revision Rockwell/Allen-Bradley products (PLC-2, PLC-3, etc.). For
Rockwell DH+ or RIO networks using newer revision products such as PLC 5 and/or SLC
processors, this maximum distance may exceed 10 miles (16 kilometers). Consult the factory for
more information on how to go greater distances, if required.)
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