14 High Speed Compare and CaptureDVP-PM Application Manual14-414.2 High Speed Compare FunctionHigh speed Compare applies FROM/TO instructions for accessing the comparison method and comparison data.The comparison function is illustrated as the below diagram.(B)F ROM K25 3 K1 D0 D50 (A)TO K25 3 K1 D0 D50(D)Data register DRn(n=0~7) (C)Control register CRn(n=0~7)(E)Da ta so urcefor co mpari so n (F)Co mpa re me tho d (G)Se lect ou tpu tter mi na l a nd c ou nte rs※Dashed lines indicate data access process and solid lines indicate the control setting processBlock A: Use TO instruction to write data into control registers (Block C) and data registers (Block D)Block B: Use FROM instruction to read data from control registers (Block C) and data registers (Block D)Block C: According to the data specified by TO instruction, control registers set up the data source (Block E),Compare method (Block F) and output terminal setting (Block G).Block D: Data registers store the data specified by TO instruction and Compare the data with the data sourcein Block E.Block E: There are 5 sets of data source including current position of X/Y/Z axis, count value of C200 (currentposition of Master / MPG of X-aixs) and count value of C204 (MPG of Y-axis). For settings of highspeed counters C200 and C204, please refer to Ch3 of this manual.Block F: Compare method: compare the data in Block D and Block E by 3 conditions: ≧, ≦, and =. Whenone of the conditions is met and the trigger method is set as “Set” (Bit7-6=0), the output terminals(CLR0, CLR1, Y2, Y3) and counters C200/C204 (when RST signal is triggered, count value will becleared and cannot resume counting) will be set ON. When trigger method is set as “Rst” (Bit7-6=1),the output terminals and counters C200/C204 (ON state will be reset and can resume counting) willbe reset.Note: In this case, the LEDs will not respond when CLR0, CLR1, Y2 or Y3 is ON. To identify theirstatus, connect CLR0-, CLR1-,C2 with 24G; CLR0+, CLR1+, Y2 and Y3 with Xn, and S/S2 with +24V.By this wiring method the LED of the corresponding X point will be ON when one of the terminals areON.Block G: When the conditions of comparison are met, one of the 6 output settings including CLR0, CLR1, Y2(00M), Y3 (00M), C200 and C204 will be set ON or reset.Process of comparison:Set up compare settings and comparison data (Block A) → Comare specified data (Block D) with data source(Block E) by the conditions set in Block F → Set/Rst output terminals or counters C200/C204 according tosettings in Block G.
