Rockwell Automation T3832 ICS Regent Historian Package for Winterpret - Manual (Page 8)

Historian Package for W INTERPRET (T3832)
8
Industrial Control Services
Figure 4. Sequence of Events Control Parameters.
Start Contact
The Start contact is a discrete variable name that an
application program may turn on to enable the sequence of
events to begin recording events. When the Start contact is
turned off, the sequence of events stops recording. Typically,
ladder logic is used to turn on the Start contact, based upon
process events or time conditions such as alarms detected,
timer timed out, etc.
The Start contact is automatically recorded by the sequence of
events when it changes state. It does not have to be included
in the event entries list.
Clear Contact
The Clear contact is a discrete variable name that an
application program may turn on to clear all the events
currently in the sequence of events buffer.
The Clear contact is automatically recorded by the sequence
of events when it changes state. It does not have to be
included in the event entries list.
Count Register
The Count register is a shared variable register name that
may be used by an application program to monitor the use of
the events buffer. Typically, ladder logic is used to monitor
the Count register and turn off the Start contact before the
events buffer is full to ensure no events are overwritten. You
may also configure your operators console to monitor the