Rockwell Automation 1404-M4_M5_M6_M8 Powermonitor 3000 Installation Instructions, PRIOR to Firmware rev. 3.0 - Manual (Page 43)

Publication 1404-IN007D-EN-P - October 2004
Powermonitor 3000 43
Table 33 and varies with the data rate. Use of a star or bridging
topology is not recommended and will result in signal distortion
unless impendance is matched for each spur (star topology) or
network (bridge topology).
Ensure that all devices on your Remote I/O network are capable of
operation at the desired baud rate. Certain legacy devices may not
support a 230.4k baud rate.
Install suitable terminating resistors at the ends of the Remote I/O
network.
At each end of each cable segment, connect the cable shields to the
SHLD terminal of the Remote I/O port connector. The SHLD
connection provides a low-impedance ground for high-frequency
noise while attenuating dc or line-frequency signals. We recommend
that you follow the standard blue/shield/clear color scheme for
Remote I/O to differentiate it from Data Highway Plus
(clear/shield/blue).
Configuration options for optional Remote I/O communications
include the logical rack address and module group (the Powermonitor
3000 is always one-quarter rack), and data rate. Defaults are rack 1,
group 0, 57.6k baud. Refer to the Powermonitor 3000 User Manual,
publication 1404-UM001.
Refer to the note at the beginning of Communication Wiring page 38.
Table 33 Remote I/O Capabilities
Baud Rate Maximum Distance Terminating Resistor
57.6k 3048m (10,000 ft) 150 ohm, 1/4 watt
115.2k 1524m (5,000 ft) 150 ohm, 1/4 watt
230.4k 762m (2,500 ft) 84 ohm, 1/4 watt
TIP
Some Remote I/O devices are equipped with internal
terminating resistors.