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Configuration |
Block structure
T640 supports the level of block structuring normally only found in
advanced DCS systems. Each of the four control loops occupies its
own task, which may be set to run at a rate appropriate to its
function in the strategy. The general purpose blocks can be
distributed between these tasks, T640’s internal architecture
ensuring data coherence. All but the M006 Fixed-Function versions are configured by the
T500 LINtools package (see Sales specification). The Fixed-
Function version is set up by simple parameterization which may be
achieved either via the front panel, or using the T510
Parameterization tool software (supplied with the controller) on a
PC fitted with an ALIN interface. Parameters may also be accessed
online from the T500 LINview package. Up to 250 function blocks can be configured, depending on the size
of the blocks and the number of connections. The table below lists
the blocks currently supported by T640 and summarises their
functions. |
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The ACTION block in the MATHS category is worth particular
mention. Like the other function blocks this block has pre-defined
I/O. However, the action of the block can be defined using
Structured Text (ST, IEC1131-3). Careful use of this block can
simplify otherwise complex collections of maths and logic blocks.
The ACTION configurator is part of T500 LINtools. |
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Continuous strategy function blocks categories |
| I/O |
Analogue and digital input/output
with manual override |
| S6000 |
Communication to panel mounted
control and signal
processing instruments |
| CONDITIONING |
Dynamic signal
processing and alarm collection |
| CONTROL |
Analogue control, simulation and
communications |
| TIMING |
Timing,
sequencing, totilization and events |
| SELECTOR |
Selection, switching, alarm and
display page |
| LOGIC |
Boolean, latching,
counting and comparison |
| MATHS |
Mathematical functions and free
format expressions |
| CONFIG |
Unit
identity blocks |
| DIAG |
Diagnostics |
| BATCH |
Sequencing
recipe/record and discrepancy checking |
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SFC sequencing
This powerful programming technique, usually only found in large
DCS and PLC environments, has been provided for applications of a
sequential or state dependent nature. Typical uses include startup
and shut down sequencing, the dynamic use of recipes, suppression
of nuisance alarms in different operating modes, automatic takeover
of controllers in fault tolerant configurations, etc. LIN family of products
The function blocks, SFCs and peer-to-peer communications are
common to the family of LIN products, allowing the appropriate
level of distribution of functions for your application. T500
LINtools provides a powerful set of configuration and engineering
tools for this family. |
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