Guidelines 139
Chapter 4 Installation and Maintenance
I⁄O Bus Considerations
If the total length of the I⁄O bus is less than 6 meters (20 feet), the I⁄O bus can be
operated without termination.
If the I⁄O bus length is greater than 6 meters (20 feet), the bus should be terminated.
The maximum I⁄O bus length is 200 meters (650 feet) and includes:
• Length of all baseplates
•I⁄O Extender modules
•I⁄O bus extension cables
An I⁄O bus termination set comprises six terminators. An I⁄O bus cable set
comprises three I⁄O bus extension cables. The terminators should be installed on
the open I⁄O bus connectors on the I⁄O Extender Modules at each end of the I⁄O bus.
I⁄O Bus Extension
Cables
2
6
0
9
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