FX5U (IQ-F) built in High Speed Counter Function.

If you are having troubles setting up high speed counters, you can follow this Mitsubishi guide

as the programming is somewhat different to an FX3 PLC.

PLCs of the FX range have historically allowed high speed signals (faster than the scan time)

to be connected to a group of the PLCs inputs. Whilst it is still possible to use equivalents of

the traditional high speed counter functions C235 to C255, LC35 to LC 55, similar functions

are available using the HIOEN function. The advantages of this instruction are that it uses a

parameterisation approach, uses Special Registers and Special Relays for its internal

resources, saving programming and reducing use of other resources.

This example shows the steps needed to enable a high speed counter function using CH1,

which is the hardware input X0.

CLICK HERE to download this technical tip.