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GFK-0825F Chapter 1 Introduction 1-7
1
Field Control in a Genius System
Using Field Control modules on a Genius bus combines the low cost, small size, and flexibility of
Field Control with the versatility, power, and communications features of the Genius system.
The Genius bus is an industrially-hardened Local Area Network (LAN). It passes I/O (control)
data and background information (datagrams) between the Bus Interface Unit and a Genius bus
controller. A Genius bus can support up to 32 devices. Each Bus Interface Unit station counts as
one device on the bus, regardless of the number or type of modules present in the station.
Other devices on the same bus can be Field Control stations, remote drops, I/O blocks, Bus
Controllers and Hand-held Monitors. Typical busses reserve one location for a Bus Controller and
one for a Hand-held Monitor, leaving 30 for additional devices. The illustration below shows a
Series 90-70 PLC connected to a Genius bus with I/O blocks and two Field Control stations.
Hand-held
Monitor
Series 90-70 PLC
Genius Bus
The Host CPU
The Genius Bus Interface Unit is ideally suited for use with a Series 90-70 or Series 90-30 PLC.
However, any type of PLC or computer capable of controlling a Genius bus can be used as the host.
Possible hosts include Series Six PLCs, Series Five PLCs, and computers equipped with a PCIM
(Personal Computer Interface Module), QBIM (Q-Bus Interface Module), or a third-party GENI-
based interface module, including several in DCS systems.