SIMATIC Industral Software - Tools for configuring and programming ...
SIMATIC Industral Software - Tools for configuring and programming ...
SIMATIC Industral Software - Tools for configuring and programming ...
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Modular PID control<br />
<strong>SIMATIC</strong> controllers are suitable <strong>for</strong> use in all sectors.<br />
They can be used <strong>for</strong> open <strong>and</strong> closed-loop control tasks.<br />
The controls can be complex <strong>and</strong> extensive. In some cases,<br />
however, they can also consist of only a few arithmetic<br />
blocks. Regardless of the size of the controller the main<br />
requirement is mostly to reduce memory space. Scalability<br />
<strong>and</strong> flexibility can be achieved with modular solutions.<br />
Modular PID control is suitable <strong>for</strong> <strong>configuring</strong> modular<br />
controls based on the modular design principle.<br />
Modular PID control comprises two components: a parameterization<br />
tool as an option <strong>for</strong> STEP 7 <strong>and</strong> control blocks <strong>for</strong> the<br />
CPU.<br />
Modular PID Control with the graphical function diagram editor CFC<br />
The main fields of application <strong>for</strong> modular PID control are<br />
process-oriented plants with high control requirements.<br />
Functions<br />
The library with function blocks <strong>for</strong> <strong>SIMATIC</strong> S7/C7 <strong>and</strong> WinAC<br />
permits the following controller types to be implemented:<br />
■ Continuous-action PID controllers<br />
■ Pulse controllers<br />
■ Step controllers<br />
The following ready-to-use examples are included in the scope<br />
of supply:<br />
■ Fixed value controller with different outputs<br />
■ Single-loop <strong>and</strong> multi-loop ratio controller<br />
■ Mixture controller<br />
■ Cascade controller<br />
■ Controller with pre-control <strong>and</strong> feed<strong>for</strong>ward control<br />
■ Range selection controller<br />
■ Alternating controller<br />
■ Multi-variable controllers<br />
The blocks can be linked with STEP 7, SCL <strong>and</strong> CFC. CFC is<br />
particularly suited <strong>for</strong> <strong>configuring</strong> complex controller structures<br />
clearly <strong>and</strong> reliably in a short time. If modular PID control<br />
is used in conjunction with the <strong>SIMATIC</strong> SM 334 analog module<br />
scan times of less than 5 ms can be achieved.<br />
Controller optimization <strong>and</strong> test functions are contained in the<br />
St<strong>and</strong>ard PID Control package.<br />
PID Self-Tuner<br />
Correct adjustment of a controller requires extensive experience.<br />
The parameterization tools st<strong>and</strong>ard PID control <strong>and</strong><br />
modular PID control have a self-tuning function. In this way,<br />
they offer the user effective support with setting the <strong>programming</strong><br />
device/PC. If conditions change during operation the<br />
controller must be optimized again. The PID self-tuner is runtime<br />
software which per<strong>for</strong>ms automatic online optimization<br />
without the need <strong>for</strong> a <strong>programming</strong> device/PC.<br />
PID self-tuner is a function block with which PID or PI controllers<br />
can be set online <strong>and</strong> adapted during operation.<br />
PID self-tuner is especially suited <strong>for</strong> optimizing temperature<br />
controllers, level controllers <strong>and</strong> flow controllers.<br />
Controller optimization of st<strong>and</strong>ard PID control with PID self-tuner<br />
Control configuration 17