Chapter 6 Applied Instructions Symbol S : High-speed counter to be refreshed S 1 : Quantity of I/O to be updated Explanation 1. The timing for the PLC to update the comparative value in its comparator is when the DHSCS or DHSCR instruction is scanned by a program successfully. However, the refresh may fail if the scan time is too long or the input signal 6_ comes too fast. In this event, users can use the instruction to assign the new comparative value to the hardware comparator in the PLC and achieve the real-time comparison. 2. S is the No of the specified high-speed counter to be refreshed.
S 1 has the same component or variable name as that in the DHSCS or DHSCR instruction and the immediate value can not be set for S 1 . If S 1 does not have the same operand as that in the high-speed comparison instruction which has been enabled, the instruction execution will not take effect. 6-175 API Instruction Operand Description 0601 D HSRF P S，S1 Immediate refresh of a high-speed comparative value Device X Y M S T C HC D FR SM SR E K 16# “$” F S S1 BOOL WORD DWORD LWORD UINT INT DINT LINT REAL LREAL TMR CNT STRING Data type S S1 Pulse Instruction 16-bit instruction 32-bit instruction ES3 － ES3