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FS-8704-12_GE-EGD Manual Page 24 of 26
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Appendix B.2. Driver Stats
EGD producers produce data messages for slave devices to consume. The type and
frequency of the messages depends on the producer configuration.
The driver counts all incoming messages of interest as the PLC_READ_MSG_RECD
statistic. Other legal messages which do not contain the data this driver is interested in are
discarded and are counted as the MSG_IGNORED statistic.
The PLC_READ_MSG_RECD statistic is incremented once by each Map Descriptor which
extracts data from an incoming message. Thus, one incoming message and three
associated Map Descriptors would cause the statistic to increase by three (when viewed
from the connection's point of view.)
This driver can expose some driver statistics by writing data to a Data Array. A special Map
Descriptor is required. The driver recognizes the Map Descriptor by its name which must be
"EGD-stats”.
The following example shows how this special Map Descriptor can be configured.
Nodes
Node_name, Protocol
null_node, ge_egd
Data_Arrays
Data_Array_Name, Data_Format, Data_Array_Length
EGD_STATS, UINT32, 100
Map_Descriptors
Map_Descriptor_Name, Data_Array_Name, Node_name
egd-stats, EGD_STATS, null_node
When the driver sees this Map Descriptor it uses the Data Array EGD_STATS (in this
example) to store driver specific statistics. Only one of these Map Descriptors may be
specified per FieldServer.
The driver stores the following data.
Array Element Contents
0 Messages Produced
1 Bytes Produces
2 Messages Received
3 Bytes Received
4 Messages Consumed
5 Messages Ignored