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19 BUILT-IN I/O FUNCTION
19.2 FX3-compatible high-speed counter function
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• If the UDCNTF instructions and HIOEN instructions are used for the same CH, it is not possible to use the
HIOEN instruction to stop the high-speed counter started by UDCNTF instructions. On the other hand, the
instruction started by the HIOEN instruction can be stopped by executing ONOFF of UDCNTF
instructions. Use caution when the HIOEN instruction and UDCNTF instructions are used together.
• Do not drive the same LC device number at the same time.
The operation of each element of the current value of a started counter and the LC
device
Shown below is the operations of the SD device, the current value of the LC device, and each element of the LC device when
the counting is started with UDCNTF instructions or is started with the HIOEN instruction while the FX3 compatible function is
valid.
: Operate
: Not operate
• When a count is started by HIOEN instruction, although LC device changes, neither a counting coil nor the
counter contact operates. Moreover, when operation is started by HIOEN instruction and LC
corresponding to CH is reset, during the RST instruction ON, operation is stopped and calculation is
resumed in OFF of the RST instruction.
Assignment for FX3-compatible high-speed counters
The high-speed counter number that can be specified with each CH
Shown here are the high-speed counter numbers (C235 to C255) of FX3 that can be selected with each CH
The current value of the SD device, each element of the LC device The start with UDCNTF
instruction
The start with HIOEN
instruction
The current value of the SD device
The current value of the LC device
The LC device counting coil
The counter contact point of the LC device
The reset coil of the LC device
CH High-speed counter No. Pulse input mode Corresponding devices Preset input logic change
CH1 C235 1-phase 1-count (S/W) LC35
CH1 C241 1-phase 1-count (S/W) LC41
CH1 C244 1-phase 1-count (S/W) LC44
CH1 C246 1-phase 2-count LC46
CH1 C247 1-phase 2-count LC47
CH1 C249 1-phase 2-count LC49
CH1 C251 2-phase 2-count (1 edge count/4 edge count) LC51
CH1 C252 2-phase 2-count (1 edge count/4 edge count) LC52
CH1 C254 2-phase 2-count (1 edge count/4 edge count) LC54
CH2 C236 1-phase 1-count (S/W) LC36
CH3 C237 1-phase 1-count (S/W) LC37
CH3 C242 1-phase 1-count (S/W) LC42
CH3 C245 1-phase 1-count (S/W) LC45
CH4 C238 1-phase 1-count (S/W) LC38
CH4 C248 1-phase 2-count LC48
CH4 C248 (OP) 1-phase 2-count LC48
CH4 C250 1-phase 2-count LC50
CH4 C253 2-phase 2-count (1 edge count/4 edge count) LC53