Mitsubishi Electric FX5 User Manual page 236

High-speed counter minimum value
These devices store the minimum values of the high-speed counters.
■Corresponding devices
The device numbers corresponding to each channel are as follows.
CPU module
CH1 CH2
SD4505, SD4535,
SD4504 SD4534
High-speed pulse input/output module
First module
CH9 CH10
SD4745, SD4775,
SD4744 SD4774
■Description
These devices stores the minimum values of the high-speed counters.
• To rewrite the minimum value, only the HCMOV/DHCMOV instruction can be used.
• If using the enable input, the minimum value is updated when the enable input is ON.
• These devices also operate when the FX3 compatible high-speed counter function is valid.
• If LC45 (CH3: Operation equivalent to C245), LC50 (CH4: Operation equivalent to C250) or LC55 (CH4:
Operation equivalent to C255) are used when the FX3 compatible high-speed counter function is valid,
special register is updated for the first time when enable input is ON. (After that, regardless of enable input,
special register is updated when the high-speed counter starts.)
■Update timing
When the current value of a high-speed counter becomes less than the minimum value, the value is updated in END
processing. When the value is read using the HCMOV/DHCMOV instruction, it is first updated to the latest value and then
read. Further, when the FX3 compatible high-speed counter function is valid, the value is updated also when UDCNTF
instruction is executed.
■Clear timing
The timing when the device is cleared is as follows.
• Power ON, Reset
24 HIGH-SPEED INPUT/OUTPUT FUNCTION
234
24.1 High-speed Counter Function
CH3 CH4
SD4565, SD4595,
SD4564 SD4594
Second module
CH11 CH12
SD4805, SD4835,
SD4804 SD4834
CH5 CH6
SD4625, SD4655,
SD4624 SD4654
Third module
CH13 CH14
SD4865, SD4895,
SD4864 SD4894
CH7 CH8
SD4685, SD4715,
SD4684 SD4714
Fourth module
CH15 CH16
SD4925, SD4955,
SD4924 SD4954