Mitsubishi Electric MELSEC iQ-F FX5 - Page 236

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25 HIGH-SPEED INPUT/OUTPUT FUNCTION
25.1 High-speed Counter Function
■Pulse density measurement mode
Select pulse density measurement mode if you want to count the number of pulses for a specified amount of time. (Page
252 High-speed counter (pulse density measurement mode))
■Rotational speed measurement mode
Select rotational speed measurement mode if you want to measure speed for a specified amount of time. (Page 255
High-speed counter (rotational speed measurement mode))
Input comparison
When the current value and the set value of the high-speed counter are compared and when they match, the output of the
specified device can be performed. (normal mode) Also, the current value and the preset value can be compared. (Preset
input comparison)
Page 257 High-speed comparison table
Page 260 Multiple point output, high-speed comparison tables
The normal input comparison or operation when there is preset input can be set by the parameter setting of the high-speed
counter (normal mode).
Whether or not to perform the preset input comparison can be set by the special devices. (Page 269 High-speed counter
preset input comparison)
Use the parameter setting value of the high-speed counter (normal mode) as the preset value. (Page 249
High-speed counter (normal mode))
High-speed counter dedicated instructions
The high-speed counter starts and stops counting using the HIOEN/DHIOEN instruction for the high-speed counter.
(MELSEC iQ-F FX5 Programming Manual (Instructions, Standard Functions/Function Blocks))
Other high-speed counter instructions
In addition to the dedicated instructions, there are instructions such as DHSCS, DHSCR, and DHSZ (hereafter referred to as
"high-speed comparison instruction") for high-speed counters.
For details, refer to the following.
MELSEC iQ-F FX5 Programming Manual (Instructions, Standard Functions/Function Blocks)
Item Description
Preset Input Enable/
Disable
Input Comparison Enable/
Disable
Enable Enable • Perform "comparison at counting + output to the specified device".
• Change the current value to the preset value when the preset input is detected.
• Perform output to the specified device when the current value matches with the
comparison value by the preset input.
Enable Disable • Perform "comparison at counting + output to the specified device".
• Change the current value to the preset value when the preset input is detected.
Disable Disable Perform "comparison at counting + output to the specified device".