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9 CREATING A HARDWARE LOGIC
9.1 Main Blocks in the Hardware Logic Outline Window
Parameter
The following table shows the parameters of the parallel encoder block.
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Link for using the parallel encoder block
The input from an encoder is stored as a preset value of the counter timer block. Because the preset value is not automatically
applied to "Count Value", performing the preset function is required. Thus, when using the parallel encoder block, always link
it to the "PRESET" terminal of the counter timer block.
For details on the counter timer block, refer to the following.
• There are the following types of multi function counter block which is linked from a parallel encoder block:
16 bits and 32 bits. When the parallel encoder block is linked to the "Absolute Encoder" terminal of a 16-bit
multi function counter block, "Preset Value" of "Counter_Timer_0", out of two counter timer blocks in the
multi function counter block detail window, is updated. Make sure to link the parallel encoder block to the
"PRESET" terminal of "Counter_Timer_0". For details on the multi function counter block, refer to
127 Multi Function Counter Block.
• When the parallel encoder block is linked to the "Absolute Encoder" terminal of a 32-bit multi function
counter block, do not change the preset value of "Counter_Timer_0" in the Multi function counter block
detail window from 0 (default value). In addition, do not set "User Address" of the preset value of
"Counter_Timer_0". When these settings are configured, the input from an encoder is not normally stored
as a preset value.
Variable name
Data type
Valid range
Default value
Description
Input Data Type
Word
Pure binary
Gray code
BCD
Pure binary
Set the input data type of the parallel interface.
• Pure binary
• Gray code
• BCD
Data Length
Word
1 bit to 12 bit
1bit
Set the input data length for the parallel encoder. When
the trigger for transfer timing is used for BCD or pure
binary, only input data of up to 11 bits can be used.
Содержание MELSEC-L Series LD40PD01
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