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Mitsubishi Electric FX5 User Manual Page 238

Melsec iq-f series.
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High-speed counter preset control switch
These devices set the preset input operation of the high-speed counters.
■Corresponding devices
The device numbers corresponding to each channel are as follows.
CPU module
CH1
CH2
SD4510
SD4540
High-speed pulse input/output module
First module
CH9
CH10
SD4750
SD4780
■Description
These devices set the timing to execute preset input. The table below shows the operations of the setting values.
Setting value
0
1
2
3
Other than above
*1 When the preset control switch is set to "3: Constant when ON", the preset input comparison cannot be used even if the parameter of
the preset input comparison (special relay) is enabled.
• While the high-speed counter is operating, the value is not reflected even if modified. It operates in the
status when the high-speed counter starts.
• These devices also operate when the FX3 compatible high-speed counter function is valid.
■Clear timing
The timing when the device is cleared is as follows.
• Power ON, Reset, STOP→RUN
■Description of operation
This section describes the operations when the preset input logic and the preset control switch are combined. The preset
value is set to 0.
• Operation when preset input logic: positive logic, preset control switch: rising edge
The preset is executed when the preset input changes OFF→ON.
ON
Preset input
OFF
ON
Count input
OFF
Current value
10
24 HIGH-SPEED INPUT/OUTPUT FUNCTION
236
24.1 High-speed Counter Function
CH3
SD4570
Second module
CH11
SD4810
Description
Executes the preset on the rising edge.
Executes the preset on the falling edge.
Executes the preset on both edges.
Constantly executes the preset when ON.
Operates as the rising edge.
Executes the preset on the rising edge.
9
8
7
6
5
4
3
2
1
0
CH4
CH5
SD4600
SD4630
Third module
CH12
CH13
SD4840
SD4870
*1
CH6
CH7
SD4660
SD4690
Fourth module
CH14
CH15
SD4900
SD4930
CH8
SD4720
CH16
SD4960

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