
2Ć4 Product Overview
Original Ć June 1990CE4.2:CL6211
2.3 The Interactive Controller Unit
The Interactive Controller Unit (IAC) is a user-configured, digital
controller for continuous processes. It has the control and computing
capability to implement complex applications requiring interaction among
several loops. The controller can perform complex strategies such as
distillation column control, industrial boiler control, and combustion
control. Operator interface is achieved through a system console or
through panel-mounted operator stations.
The Type CL6011 Interactive Controller Unit consists of various printed
circuit card assemblies and interconnect assemblies that are combined
to form four models as follows:
H 2-wide unit
H 3-wide (with discrete I/O) unit
H 3-wide (with process I/O) unit
H 4-wide unit
Each of the four models contains a microprocessor unit (MPU) card
assembly. The MPU card performs the central processing for the
controller and handles all communications between the controller and
devices on the data highway, such as a console. All calculations use
floating- point arithmetic to reduce scaling requirements. The MPU card
also produces and receives discrete signals to and from field devices.
In addition to the MPU card, each model also contains one or two Type
CL7015 Process I/O Assemblies. The process I/O card accepts analog
input signals from field devices, performs analog-to-digital and
digital-to-analog conversions, and generates analog output signals to
field devices. Since the process I/O card has its own microprocessor, it
maintains all analog outputs independent of the MPU card for added
security. Each process I/O card has two ports through which the
controller can communicate with two operator stations.
Two of the interactive controller models contain a Type CL7014 Discrete
I/O Assembly. The discrete I/O card receives discrete signals from field
devices and produces discrete signals to field devices. In addition, the
discrete I/O card has two operator station ports.
The 2-wide and 4-wide interconnect assemblies provide all the
necessary electrical connections between the card assemblies. The Type
CL7016 Interconnect Assembly (2-wide) provides connections between
the two cards of the 2-wide model, occupying two slots in a controller
card file. The Type CL7006 Interconnect Assembly (4-wide) provides
connections between the three or four cards of the 3 or 4-wide models,
occupying four slots in a controller card file. Both interconnect
assemblies attach to the backplane of the controller card file; in this way,
interconnects are made simultaneously with card file connections when
the controller cards are installed in the card file.
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