FieldServer FS-8704-12 - Manual (Page 9)

FS-8704-12 GE-EGD Driver Manual Page 9 of 23
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5.3.3 Map Descriptor Example 1: - S imple Consumer Map Descriptor
In this example the basics required for each consumer Map Descriptor are explained.
Map_Descriptor_Name , Data_Array_Name , Data_Array_Offset , Function , Node_Name , Length , Ge_ProducerID , Ge_ExchangeID , Ge_Data_Type
A1 , DA_AI3 , 0 , Passive , Node_A , 20 , 0.0.0.1 , 1 , Int
Data processed by
this Map
Descriptor will be
stored in this
array.
The first element
of data will be
stored in the Data
Array in the 6th
position (Array
elements are
indexed from
zero.).
Map Descriptors
defined to
consume EGD
data must be
passive.
The node name
ties the Map
Descriptor to a
node which in
turn ties the Map
Descriptor to an
adapter and a
protocol.
This is the number of
data elements that
will be consumed
from the message be
processed using this
Map Descriptor.
This is the dot format ID of the producer,
not the IP address of the producer's
Ethernet node.
This value identifies the producing
processor.
This and the exchangeID uniquely identify
a produced data packet.
This is a numeric value assigned
by the PLC programmer to
identify a specific data exchange
to be received by the
consuming device (the
FieldServer in this case). It must
match the ID specified in the
producer. The data in the data packet will be treated as 16 bit
(two byte) signed integers. As the length=20 a total
of 40 bytes will be processed.
The type of the Data Array should be capable of
storing signed integers in this example.
If you do not use this keyword then the driver will
process the data as bytes.
Refer to Appendix A.1