97
P a r r I n s t r u m e n t C o m p a n y
1 - 8 0 0 - 8 7 2 - 7 7 2 0
4
R e a c t o r C o n t r o l l e r s
While a maximum of 99 profiles can be stored in the controller
itself, an unlimited number can be stored in the operator’s PC for
rapid transfer to the controller.
In addition to the setpoint profiling capability, the controller is
also equipped with a setpoint scheduling function. This feature
can operate up to 8 profiles operating on a common time base.
Screenshot of typical 4871 Controller user interface main screen.
Process Flow Diagram with real-time process renderings and control capabilities.
The 4871 Controller includes Operational
Sequence Control
The sequence control function offered by the
4871 Controller greatly expands the capabilities
of this control for users who wish to control
reactor systems. The operation of valves,
pumps and other peripheral devices can be
programmed on either a time or an event driven
basis. Sequences can be very simple timed
events or they can be very complex with multiple
nested default sequences programmed to occur
only if process feedback indicates a need to take
alternative actions.
Communications Channels
Each 4871 Controller is equipped with a
RS-232 and Ethernet communication port. The
RS-232 port is used to establish fundamental
control logic. The Ethernet port provides com-
munication with the host PC when using the
SpecView GUI program. Multiple controllers,
each with a unique address, can be networked
on the Ethernet interface with a single connec-
tion to the PC.
The principal advantage of the Ethernet
interface is that it allows the user to use an
existing network infrastructure to connect the
controller to the PC. As a result, one can operate
the controller over the network from anywhere
within your facility. Additionally, Internet access
