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FS-8704-12 GE-EGD Driver Manual Page 12 of 23

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6.3 Server Side Map Descriptors

Only one Map Descriptor may be configured for each ExchangeID. Each produced exchange is thus limited to one

data type and to data from one Data Array. This is different from the configuration of consumer Map Descriptors.

6.3.1 FieldServer Specific Map Descriptor Parameters

Column Title

Function

Legal Values

Map_Descriptor_Name

Name of this Map Descriptor

Up to 32 alphanumeric characters..

Data_Array_Name

Name of Data Array where data is to be

stored in the FieldServer

One of the Data Array names from

Section 4

Data_Array_Location

Starting location in Data Array

0 to (Data_Array_Length-1) as specified

in Section 4

Function

Function of Client Map Descriptor

Wrbc

6.3.2 Driver Specific Map Descriptor Parameters

Column Title

Function

Legal Values

Node_Name

Name of Node to fetch data from

One of the Node

names specified in

Section 6.2.

Length

Length of Map Descriptor

1 - 1000

Ge_ProducerId

This identifies the GE device producing the EGD data. Although in

decimal dot format, it is not an IP address and does not necessarily

correspond to the IP address of the GE-Ethernet port producing the

message. It corresponds to the producer ID configured for the CPU

producing the data.

The default value is typically the same as the IP address of the

producer but the value can be changed and it is possible for one

device to have multiple Ethernet interfaces and hence multiple IP

addresses. Any change to the producerID must be matched by a

similar change in the consumer's configuration.

Nnn.nnn.nnn.nnn

Where nnn are in the

range 0-255.

Ge_exchangeId

This and the producerID uniquely identify a packet of EGD data. Thus,

the consumer uses these two parameters to update. Any change to

the exchangeID must be matched by a similar change in the

consumer's configuration.

Integer values >= 1

Ge_data_type

Each produced data packet contains raw packed data. This keyword is

used to tell the driver how to pack the data into the message. Thus

data can be read from a BIT array in the FieldServer and sent as words

for storage in %R (register memory) in the GE-PLC. Any change to the

data type must be matched by a similar change in the consumer's

configuration.

Refer to Appendix C.1.

6.3.3 Timing Parameters

Column Title

Function

Legal Values

Scan_Interval

Rate at which data is produced. This is the equivalent of the producer interval.

>0.1s

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 22 23

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