PLX51-DL-232
Preface
Data Logger
User Manual
ProSoft Technology, Inc.
Page 7 of 59
The Log Index is managed by the PLX51-DL-232 and incremented each time a new
record is stored. The Unload Index is managed externally by the unload service. It is
only incremented after a record has been logged successfully to a text file. The records
can be unloaded in Logix with the Example Code. Both the Log Index and Unload
Indices loop around, eventually reaching the end of the cache. The cache becomes
100% full when the Log Index loops around and equals the Unload Index. In this
situation, either older records are overwritten (Log Mode = Overwrite) or newer records
are not logged (Log Mode = Hold).
Figure 1.2. - Memory Schematic
The PLX51-DL-232 is configured using the ProSoft PLX50 Configuration Utility. This
program can be downloaded from
, free of charge. The
PLX50 Configuration Utility offers various configuration methods, including a controller
tag browser. The PLX50 Configuration Utility can also be used to monitor the status and
download historical data to a local file.
The PLX51-DL-232 can operate in both a Logix “owned” and standalone mode. With a
Logix connection, the input and output assemblies provide additional diagnostics
information. This information is available in the Logix controller environment.
The PLX51-DL-232 uses isolated RS232 for DF1 communication. The RS232 port also
uses a terminal block for convenient installation.
A built-in webserver provides detailed diagnostics of system configuration and operation.
