EIP Protocol
PLX3x Series ♦ Multi-Protocol Gateways
User Manual
Page 52 of 215
ProSoft Technology, Inc.
January 25, 2018
Note: If you want to access module status data in the upper memory, you can use the data
mapping feature in the gateway to copy data from the module status data area to the user data
area. See Mapping Data in Module Memory (page 24). Otherwise, you can use the diagnostic
functions in ProSoft Configuration Builder to view module status data. For more information on the
module status data, see Network Diagnostics (page 70).
EIP Client Access to Database
The client functionality exchanges data between the 's internal database and
data tables established in one or more processors or other server based devices.
The command list that you define in ProSoft Configuration Builder specifies what
data is to be transferred between the gateway and each of the servers on the
network. No ladder logic is required in the processor (server) for client
functionality, except to assure that sufficient data memory exists.
The following illustration describes the flow of data between the Ethernet clients
and the internal database.
Multiple Server Access to EIP Database
Server support in the gateway allows client applications (such as HMI software
and process
ors) to read from and write to the gateway’s database. The server
driver is able to support multiple concurrent connections from several clients.
When configured as a server, the user data area of the internal database in the
gateway is the source for read requests and the destination for write requests
from remote clients. Access to the database is controlled by the command type
received in the incoming message from the client.
