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19  BUILT-IN I/O FUNCTION

19.1  High-speed Counter Function

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)

The high-speed counter function execution procedure is as follows.

Check the specifications of the high-speed counter.

Check specifications such as maximum frequency and type of high-speed counter. (Page 115 High-speed counter 
specifications)

Connect the CPU module to the external device.

For details on wiring to external devices, refer to the following manual
MELSEC iQ-F FX5U User's Manual (Hardware)
MELSEC iQ-F FX5UC User's Manual (Hardware)

Set the parameters.

Set parameters such as channel (CH) of the high-speed counter. (Page 123 High-speed counter parameters)

Create the program.

Create program for using the high-speed counter.

Run the program.

High-speed counter specifications are explained below.

Types of high-speed counters are as follows.

■1 phase, 1 input counter (S/W)

Counting method of 1 phase, 1 input counter (S/W) is as follows.

■1 phase, 1 input counter (H/W)

Counting method of 1 phase, 1 input counter (H/W) is as follows.

ON

OFF

Current value

Up counting

Down counting

A-phase input

ON

OFF

Count direction switching bit

ON

OFF

Current value

Up counting

Down counting

A-phase input

ON

OFF

B-phase input
(Count direction switching input)