GE Industrial Solutions HE300GEN251 - Manual (Page 29)

PAGE 30 23 SEP 1999 CH.4: GENIUS
Each of the (up to) 32 devices on the network is assigned a Genius Bus Address ranging from 0 to 31.
Bus Controllers are most typically assigned a Genius Bus Address of 31. In applications with redundant
bus controllers, the “backup” bus controller is address 30. Bus address 0 is normally reserved for the
Genius Hand Held Monitor.
Among other tasks, the bus controller allows Genius I/O (including the drives) on the network to be
mapped into PLC memory, monitoring inputs and controlling outputs. Intelligent, data intensive Genius
devices also share their data with the PLC through communications with the bus controller.
4.3 Genius Communications Services
As stated previously, the Serial Bus Interface Genius option card allows the drive to reside directly on the
Genius LAN, providing drive control and data access capabilities to the PLC. There are three types of
communications that can occur on the Genius LAN. These are I/O Services and Global Data. The Serial
Bus Interface option card supports all three of these communications types.
4.4 I/O Service
I/O Service is the manner in which data is transferred to and from Genius I/O Blocks. Outputs are
selectively written to each I/O block from the CPU bus controller each scan. Many I/O blocks also
broadcast inputs to the bus every bus scan.
4.5 Global Data
Global data is data broadcast over the network at large, with no particular “destination”. Each Genius
device has the capacity to broadcast up to 128 bytes of global data. Intelligent devices which reside on
the LAN (bus controllers, OIUs, etc.) can read this data off the network. These devices are intelligent
enough to interpret this data, as the data content differs from Genius device to Genius device. Drive
feedback data consists of parameters such as speed reference, torque, current, faults, function settings,
etc. The Serial Bus interface allows the system designer to select which data is broadcast by the drive as
global data. This is important for two reasons. First of all, the data which is desired to be monitored on a
regular basis varies from application to application. Second, the amount of global data broadcast by the
drive is directly proportional to response time.
In general, the procedure for configuring the drive’s Global output data is a process of mapping the global
output data words to drive parameters. There are three different means in which this “mapping” of global
data output words to drive parameters can be accomplished. These are; from the keypad, from the
Genius Hand Held Monitor, and from the optional personal computer configuration utility. Chapters are
dedicated to each of these configuration means.