95
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
4871 Process Controller
T
he Parr Model 4871 Process Controller has
been developed to provide an integrated
stand alone control system for controlling either
a single reactor with multiple feed and product
controls or multiple reactors operating indepen-
dently or in parallel.
The Parr 4871 Process Controller com-
bines a single turnkey system containing
the following components:
Control Module:
• Honeywell HC-900 Hybrid Controller.
Flexible, Powerful Software:
• SpecView SCADA software.
• System set up with graphical user inter-
face configured to individual requirements.
Power Controller
• Parr 4875 Power Controllers for handling
heating, cooling, safety, and motor control
devices.
Control Module
The control module of the Parr 4871 Process
Controller is a Honeywell HC900 Hybrid
Controller. This controller combines analog
and logic control into a versatile, cost-effective
controller designed specifically for process appli-
cations requiring analog measurement combined
with programmable control actions.
Input / Output
The controller is adapted to each users
requirements by adding to the control chas-
sis input, and output modules. Each module
provides for between four and sixteen individual
inputs or outputs fully isolated from one another.
These modules include:
Input Modules:
The analog inputs are of univer-
sal type and are most commonly used for ther-
mocouple or RTD temperature sensors, strain
gage type pressure transducers, and similar
devices with mV, V, or resistance inputs. Input
isolation, cold junction compensation, and burn-
out protection are incorporated into the circuitry.
Each analog input module provides for eight
separate inputs.
The digital inputs can be logic inputs or contact
closures. These are typically used for sensing
valve positions or conditions of safety devices.
Each digital input module provides for sixteen
separate inputs.
Function
Analog Input (AI) Maximum Channels
480
Analog Output (AO) Maximum Channels
200
Digital I/O Maximum Channels
1920
Remote I/O
Yes
Control Loops
Per Memory
Logic Scan
25-50 ms
Loop Scan
500 ms
Ethernet Communications
Yes
Peer to Peer Communications
Yes
Modbus Master
Yes
Modbus Slave
Yes
On-line Programming
Yes
Function Blocks
2000
Sequential Functions
Yes
E-mail Alarms
Yes
