Rockwell Automation T6200 Compressor Anti-Surge and Capacity Controller - Manual (Page 12)

Product Overview
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diagnostics and also monitors the status of the other control board which provides for a reliable
transfer and redundancy scheme.
On Line Diagnostics
The T6200 Controller has on-line diagnostics designed to identify failures quickly. On all (primary
and backup) operator interfaces, highways, local communications, the Controller run diagnostics on
a continuous basis. These routines continuously check the status of critical device functions to detect
failures.
If a failure is detected an alarm is activated to inform the operator and the backup unit is enabled.
Configuration Security
The T6200 Controllers maintain identical configuration at all times. At startup, when both control
boards are powered up, the backup control board’s memory is always cleared, and the active control
board transfers the configuration to the backup control board through the backup serial link, if it has
a backup control board.
During operation (runtime), if new configuration is downloaded (to active control board), it
automatically goes to both the primary and the backup control board. Thus configuration integrity is
achieved and there are no mismatches.
Uninterrupted communication and control is provided by automatically transferring all configuration
and communications of the active control board to the backup redundant control board. There is a
complete transparency in the redundant control board. Apart from notification of failure, there is no
change in the operator interface.
Controller Redundancy
The T6200 Controller redundancy concept allows the user to simply plug-in a backup control board
side-by-side with the primary control board. The user has no installation or cable connection
requirements. Termination panel data links enable the backup to copy the input/output and control
configuration of the primary control board and to assume virtually immediately the input/output and
control functions in case of a primary malfunction.
Each control board contains, in addition to the input/output functions, an extensive library of control
algorithms. Thus, the T6200 Controllers can be configured as totally stand-alone intelligent
controllers or RTUs. This minimizes dependency on communications, resulting in high reliability.
Dual Non-Redundant Controller
The T6200 Dual Non-Redundant Controller concept allows the user to have two independent
controllers (a primary and a second controller) in one chassis thereby reducing the required panel
space by half. With this option, two T6200-C Controller cards or two T6200-D Controller cards or a
T6200-C and a T6200-D Controller card may be plugged into a single chassis. Two Remote I/O
Termination Panels (one for the primary controller and one for the second controller) are required
with this concept. The Dual Non-Redundant Controller option should only be used when controller
redundancy is not foreseen as a requirement.