Operands

Input information for the Fast Counter	<−	Output information of the user program
Start Value 1	<−	Output double word 0
End Value 1	<−	Output double word 1
Start Value 2	<−	Output double word 2
End Value 2	<−	Output double word 3
Control Byte 1 *1)	<−	Output byte 0
Control Byte 2 *1)	<−	Output byte 1

*1) Only for CI581-CN/CI582-CN: Control bytes 1 and 2 are available double on grounds of data consistency. At this a Start and End evaluation is only effected if the signals “Control Byte1_0” and “Control Byte1_1” or “Control Byte2_0” and “Control Byte2_1” (process image) are identical.

Meaning of the input information for the Fast Counter:
Start value 1	Double word	Set values for the counters 1 and 2: Each counter can be set to a start value. Start values are loaded into the counter by the user program. Using the set signal (dependent on the operating mode either via a terminal or the bit SET within the control byte 1 or 2), the values of the double word variables are loaded into the counter 1 or 2.
Start value 2	Double word
End value 1	Double word	End value for the counters 1 and 2: The end values for the two counters are stored as comparison values into the module by the user program. Both counters compare continuously whether or not their programmed end value is equal to their actual value. When the counter (actual value) reaches its programmed end value, the binary output CF of the status byte is set permanently.
End value 2	Double word
Control byte 1	Byte: Bit 0 = UP/DWN Bit 1 = EN Bit 2 = SET Bit 3 to Bit 7 free	Control bytes for the counters 1 and 2: UP/DWN: In some operating modes, the counter can count downwards, too. If counting down is desired, set the bit UP/DWN to TRUE and the bit SET to 1. When doing so, the counter starts counting downwards at the start value (set value) to the end value (max. from 4,294,967,295 to 0 or hexadecimal from FF FF FF FF to 00 00 00 00). After reaching 0 the counter jumps to 4,294,967,295. EN: The processing of the counter signals must be enabled. Depending on the operating mode, enabling is done via a terminal or by the bit EN = TRUE within the control byte. SET: The counter can be set to a start value (see the description of the set values for the counters 1 and 2 at the beginning of this table.
Control byte 2

Output information of the Fast Counter	−>	Input information for the user program
Actual Value 0	−>	Input double word 0
Actual Value 1	−>	Input double word 1
Status Byte 0	−>	Input byte 0
Status Byte 1	−>	Input byte 1

Meaning of the output information of the Fast Counter:
Actual Value 0	Double word	Actual value of the counter 0
Actual Value 1	Double word	Actual value of the counter 1
Status Byte 0	Byte: Bit 0 = CF Bit 1 to Bit 7 free	CF: When the counter reaches the programmed end value, the counter output is stored permanently as CF = TRUE (end value reached). Only when the counter is set again (set value), CF is reset to FALSE.
Status Byte 1