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5-16 Field Control™ Genius® Bus Interface Unit User’s Manual
–
October 1999 GFK-0825F
5
Configure the Network Map for the Bus Interface Unit
The next screens are used to assign the starting addresses and lengths for the Bus Interface Unit's
network map.
This is the data exchanged on the Genius bus.
Blk Map Start I
?
< > entr
Indicates no data
type has been
selected yet.
I discrete inputs (bits)
Q discrete outputs (bits)
A analog inputs (16-bit words)
AQ analog outputs (16-bit words)
If the system host is a Series 90 PLC, the lengths must correspond to the memory assignments
made for the Bus Interface Unit during PLC configuration. The starting data addresses configured
for the BIU network map and the I/O modules in the station usually match the references
configured for the PLC, but that is not required.
If the network controller is a Series Six or Series Five PLC, only the length selected here is used;
the entry made on the starting address screen is not relevant to PLC. For those PLC types, the
starting address was assigned on an earlier screen.
The following table shows the maximum amount of each data type that may be configured in the
network map, and the highest reference address available for each type.
BIU Memory
Type
Used For Maximum
Length for
Network Map
Highest Available
Reference Address
I discrete inputs, and status data
from intelligent modules
up to 1024
contiguous bits
65535
Q discrete outputs, and fault clearing
for intelligent modules
up to 1024
conti
g
uous bits
65535
AI analog inputs up to 64
contiguous
words
9999
AQ analog outputs up to 64
contiguous
words
9999
Data to be exchanged on the bus must use references configured here. Any I/O modules (
or
portions of modules
) configured outside the network map will be scanned by the Bus Interface
Unit, but the data will not be exchanged on the Genius network bus.
The I/O references of modules in the I/O station are configured separately. Individual I/O modules
may be configured anywhere within available memory. It is possible to have inputs or outputs
within the I/O station that are not exchanged on the Genius bus-that is, data that is completely local
to the I/O station. For example, the I/O station might include a Micro Field Processor performing
local data processing.