PND Protocol
PLX3x Series ♦ Multi-Protocol Gateways
User Manual
Page 182 of 215
ProSoft Technology, Inc.
January 25, 2018
10.1.2 PND Internal Database
The internal database is central to the functionality of the PLX3x gateway. The
gateway shares this database between all the communications ports on the
gateway and uses it as a conduit to pass information from one protocol to
another device on one network to one or more devices on another network. This
permits data from devices on one communication port to be accessed and
controlled by devices on another communication port.
In addition to data from the Controller, you can map status and error information
generated by the gateway into the user data area of the internal database. The
internal database is divided into two areas:
Upper memory for the module status data area. This is where the module
writes internal status data for the protocols supported by the module.
Lower memory for the user data area. This is where incoming data from
external devices is stored and accessed.
Either protocol in the PLX3x gateway can write data to and read data from the
user data area. The gateway functions as a PROFINET Device, and an external
PROFINET Controller can read data from, or write data to, the gateway user data
area.
