2 Functions of Devices in DVP-PLC (ii) When DHSZ instruction uses new added high-speed counters, it can only use one group of SV in the comparator. (iii) The number of SVs in high speed comparison instructions offered by SA/SX series MPU will not decrease owing to the increasing of high-speed counters. (iv) If the output device of the high-speed comparison instruction DHSCS requires high-speed output, it is recommended you use Y10 or Y11 for the output. If you use other general devices, the output will delay for 1 scan period for its setup or clearing. For example, if I0x0 interruption is set, C243 will correspond to I020, C245 to I040, and C250 and C255 to I060.
(v) The high speed comparison instruction DHSCR is able to clear the counter, but only the counters used in the same instruction, e.g. DHSCR K10 C243 C243. This function only applies to 4 special high-speed counters C243, C245, C250 and C255. 5. Counting modes: a) The 2-phase 2 inputs counting mode of the high speed counters in ES/EX/SS (V5.5 and versions above) and SA/SX/SC series MPU is set by special D1022 with normal frequency, double frequency and 4 times frequency modes. The contents in D1022 will be loaded in the first scan when PLC is switched from STOP to RUN. b) Multiplied frequency mode ( indicates the occurrence of counting) DVP-PLC Application Manual 2-23 Device No.
Function D1022 Setting up the multiplied frequency of the counter D1022 = K1 Normal frequency mode selected D1022 = K2 or 0 Double frequency mode selected (default) D1022 = K4 4 times frequency mode selected Counting mode Counting wave pattern 2-phase 2 inputs 1 (Normal frequency) A-phase B-phase Counting up Counting down 2 (Double frequency) A-phase B-phase Counting up Counting down 4 (4 times frequency) A-phase B-phase Counting up Counting down