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Description
Designed to offer outstanding
control performance in a compact
DIN rail package the RFS provides
a comprehensive solution for
a wide variety of applications:
such as plastic manufacturing,
packaging machinery and food
processing applications requiring
precise heat/cool control and
process protection alarming.
Ideal
as a slave PID loop to a programmable
logic controller the RFS offers
a cost effective alternative
to performing loops in a PLC
while at the same time improving
loop performance. All inputs
and outputs can be read directly
over the Modbus communication
interface by the supervisory
host system. Additionally, the
master can write to RFS outputs
that are not assigned as alarm
or status functions. This expands
the available PLC and host supervisory
system I/O, simplifies machine
troubleshooting and provides
the ability to perform remote
diagnostics.
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The
RFS accepts one universal process
input suitable for thermocouple,
resistance thermometer or linear
mV/mA and coupled with a responsive
Smart PID self tuning algorithm
it is equipped with special
functions including soft start
and non-linear cooling. Smart
tuning automatically adjusts
the PID sets according to the
current process dynamics without
the need to cycle the process
and therefore has no detrimental
effect on the current operating
conditions. Three outputs are
available providing a heat plus
two alarms or heat/cool plus
one alarm configuration. A complete
set of process protection alarm
functions: high and low limit,
band and deviation are all included.
Modular
interconnection allows simultaneous
connection of all common instrument
elements: power supply, serial
interface, logic input and open
collector output for common
alarms. Making use of this interconnection
the RFS-AL adds alarm expansion
capability to RFS loop controllers
connected to the same interconnection
bus.
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