Mitsubishi Electric MELSEC-L Series LD40PD01 User Manual page 153

Monitor
The following table shows the monitors of the counter timer block.
Variable name Data type
Count Value Word
Latch Value Word
Overflow Word
Underflow Word
*1 Even when no "User Address" is assigned, an overflow and an underflow are detected and the multi function counter block  overflow
error (error code: 100H) and the multi function counter block  underflow error (error code: 101H) occur. These errors are detected
only when the linear counter mode is set for 32-bit counter timer blocks.
The following table shows "User Address" used for the monitors.
Variable name Data type
User Address Word
Description
A count value is stored in the buffer memory area specified with "User Address".
A latched count value is stored in the buffer memory area specified with "User Address".
When an overflow is detected, 1 is stored in the buffer memory address specified with "User Address".
When an underflow is detected, 1 is stored in the buffer memory address specified with "User Address".
Linkable block Valid range

1000 to 1099
Description
Only even addresses can be assigned to monitors of
two words (32 bits).
9 CREATING A HARDWARE LOGIC
9.2 Multi Function Counter Block
9
*1
*1
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