Руководство - руководство по программированию в среде U90 Ladder (англ.язык)
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Example
The math function add is executed by the Add function block shown below.
Input Operands A & B must be integer values: MI , SI or #constant integer value.
Output Operand C may be a Memory Integer or a System Integer.
Add Examples
You can use the Add function to add an MI value to an integer value.
You can use the Add function to add two MI values.
You can use the Add function to add two integer values.
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You can use Add function blocks in series.
Divide
Examples
The math function divide is executed by the Divide function block shown below.
Input Operands A & B must be integer values: MI , SI or #constant integer value.
Output Operand C may be a Memory Integer or a System Integer.
The Divide function can only return whole numbers. This function does not support floating point integers.
Examples: 7.2 and 9.5.
Use System Integer 4 (SI 4 - Divide Remainder) to find the exact integer value of a division function that may
involve a remainder.
Note that you must use the remainder value in SI 4 immediately after the division function. SI 4 will be written
over with the next division function and the specific remainder value will be lost.
System Bit 4 (SB 4 - Divide by Zero) will activate if the division operation will inadvertently result in a division
by zero and return zero in Operand C.
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Division Examples
Remember that any remainder of a Division function will be written into SI 4. You must use any remainder
value immediately after the Division function because SI 4 will be written over with the next division function
and the specific remainder value will be lost.
SB 4 (Divide by Zero) will activate if the division operation will inadvertently result in a division by zero and it
will return zero in Operand C.
You can use the Division function to divide an MI value and integer value.
You can use the Division function to divide two MI values.
You can use the Division function to divide two integer values.
You can use Math function blocks in series.
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Division Function: Remainder values
To get the remainder value of a Division function:
1. Enter the desired Operands into the Division function block.
2. Select System Integers from the Window Menu on the Standard Menu bar.
3. SI 4 holds the Remainder value for the most recent Division operation.
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According to the above example:
If MI 10 = 7 and MI 11 = 2, then MI 12 = 3 and SI 4 = 1
Multiply
Examples
The math function Multiply is executed by the Multiply function block shown below.
Input Operands A & B must be integer values: MI, SI or #.
Output Operand C may be a Memory Integer or a System Integer.
Multiplication Examples
You can use the Multiplication function to multiply an MI with an integer value.
You can use the Multiplication function to multiply two MI values.
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You can use the Multiplication function to multiply two integer values.
You can use Multiplication function blocks in series.
Subtract
Examples
The math function subtract is executed by the Sub function block shown below.
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Input Operands A & B must be integer values: MI , SI or # constant integer value.
Output Operand C may be a Memory Integer or a System Integer.
Subtraction Examples
You can use the Subtraction function to subtract between an MI value and an integer value.
You can use the Subtraction function to subtract between two MI values.
You can use the Subtraction function to subtract between two integer values.
You can use Subtraction function blocks in series.
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Math functions: Constant integers, MI,or SI
To execute a math function between an integer and MI/SI:
Each Math function has 3 elements: 2 input values and 1 output value. Each of these 3 elements has the
possibility of being an integer (as well as a MI or SI).
From the Select Operand and Address dialog box select # for the Operand type and Address. Enter the integer
(number) value in the Symbol box.
Store Functions
An MI Operand contains an integer value (-32768 to +32767).
There are two ways to store an integer value in an MI:
Store Direct
Store Indirect
The last integer value written into a specific MI will overwrite any previous integer value stored there before.
Example:
MI 6 = 35. You then write the value 37 into MI 6, the value 35 will be replaced by the value 37.
Store functions are featured in several sample applications, such as the application ' History of Events'. These
applications may be found by selecting Sample U90 Projects from the Help Menu.
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Store Direct function
Store Direct allows you to write a constant, MI or SI value into another MI or SI.
To use the Store Direct function:
1. Click Store on the Ladder Toolbar.
2. Select Store Direct from the Store Menu.
3. Move the Store Direct element to the desired net.
4. Enter the desired Operands and Addresses.
5. The Store Direct element appears on the net with the set Operands and Addresses.
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According to the above example, the value in MI 3 will be stored in MI 100. The previous value in MI 100 is
lost. The current value in MI 3 remains unchanged.
Store Indirect function
Store Indirect allows you to write an integer value (constant, MI or SI ) into another MI or SI using indirect
addressing.
For example:
When using the Store Indirect MI, if the value stored in the B parameter is 5; then MI 5 is the address where the
value will be stored.
When using the Store Indirect SI, if the value stored in the B parameter is 2; then SI 2 is the address where the
value will be stored.
For example:
According to the above example:
If MI 30 contains the constant 5; then #27 will be stored in MI 5.
If MI 30 contains the constant 35; then #27 will be stored in MI 35.
There are two types of Store Indirect function:
The Store Indirect MI function relates to the MI address.
The Store Indirect SI function relates to the SI address.
To use the Store Indirect function:
1. Click Store on the Ladder Toolbar.
2. Select Store Indirect MI on the Store menu.