下面代码为西门子博图的一个实例功能块的SCL程序代码。
实例:PID_Temp_Multizone
FUNCTION_BLOCK "SimMultizone"
{
S7_Optimized_Access := 'TRUE' }
VERSION : 0.1
VAR_INPUT
velocity : SInt; // Mass transport velocity in %
ambTemp : Real := 20.0; // Ambient temperature
reset : Bool; // Reset block
cycle : Real := 0.1; // Cyclic interrupt time in seconds
END_VAR
VAR_OUTPUT
error : Bool; // Error occurred (block stopped working)
statusID : UInt; // Error source (see comment)
status : Word; // Error code (see comment)
maxReached : Bool; // Output of "LSim_PT1" or "LSim_PT2aper" has reached max. limit
minReached : Bool; // Output of "LSim_PT1" or "LSim_PT2aper" has reached min. limit
END_VAR
VAR_IN_OUT
zones : Array[1..#MAX] of "typeZone"; // Zone parameters
END_VAR
VAR
statZ : Array[1..#MAX] of "typeDynState"; // Internal parameters for calculation
instPT2Z : Array[1..#MAX] of "LSim_PT2aper"; // LSim_PT2aper instances
instHeatZ : Array[1..#MAX] of "LSim_PT1"; // LSim_PT1 instances for heating
instCoolZ : Array[1..#MAX] of "LSim_PT1"; // LSim_PT1 instances for cooling
END_VAR
VAR_TEMP
tempIndex : DInt;
tempKFor : Real;
tempKBack : Real;
END_VAR
VAR CONSTANT
MAX : DInt := 3; // Numbers of zones
TMLAG_HEATER : Real := 5.0; // Time constant for PT1 (heating)
TMLAG_COOLER : Real :=

这是一个关于西门子博图(SIMATIC TIA Portal)中实现PID温度多区控制的SCL程序实例。代码包括输入、输出变量,以及加热、冷却功能块的PT1和PT2模拟。程序通过内部参数和循环中断时间进行温度区间的耦合模拟,同时处理错误状态和极限值检查。
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