9. Long Term Datalogger
Issue 06/15 Publication PUB059-002-00 121 of 136
9. LONG TERM DATALOGGER (LTD)
P3 master stations, delivered after May 2011, will contain a Long Term Datalogger (LTD) module. In
the case of the hot standby master station, the LTD and the key switch are contained in the same
module. For a single channel unit the module will be in the middle slot, which previously contained a
blank module.
Fig 84: Hot standby master station with Long Term Datalogger (LTD)
The LTD independently captures and stores all messages directed to the master station from the host
connections and all the messages that occur between modules connected on the master station back
plane. This information includes host Modbus commands and changes in field unit status information.
Information is stored on a microSDHC (Secure Digital High Capacity) memory card located at the front
of the module for easy extraction. A 4 GByte memory card is supplied as standard. One file is
created on the memory card for each day. The size of each file is dependent on how often the master
station is accessed by the host. In practice, each day file is generally about 1 MByte.
The data is viewed on an application called LTD Viewer, which can be downloaded from the Rotork
web site. A memory card reader is required to connect the memory card to a computer to enable the
data to be viewed.
The information monitored and recorded by the LTD can be saved for future reference and gives total
visibility of every command and status update for every Pakscan device on the network. This
information can be used by site engineers as part of their asset management function.
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