Flashcards in Chapter 11 Deck (27):
To a predetermined step by step process that accomplishes a specific task.
Frequently used for reversing the direction of AC and DC motors, or for controlling multispeed motors with two to four speed settings
An output instruction that uses a file or an array to control various output devices
Sequencer output (SQO)
An input instruction that compares bits from an input file or array to corresponding bits from a source address
Sequencer input (SQI)
An output instruction that compares bits from an input source file to corresponding bits from data words in a sequence file. If all pairs of bits are the same then a bit in the control register is set to 1
Sequencer compare (SQC)
An output instruction that functions like a word to file or file to file transfer
Sequencer load (SQL)
In the starting address for the registers in the sequencer file and you must use the indexed file indicator (#) for this address
The coed or bit pattern through which the sequencer instruction moves source data to the destination address
The address of the input word or file for an SQC from which the instruction obtains data for comparison to its sequencer file
The address of the output word or file for an SQO to which the instruction move data from its sequencer file
The address that contains parameters with control information for the instruction and discrete output to indicate sequencer instruction
The found bit (FD) is only used for the SQC instruction
The error bit (ER) indicates a negative position value or negative or zero length value
The done bit (DN) is set by the SQO or SQC instruction after it has operated on the last work in the sequencer file
The enable bit (EN) is true when the rung goes form false to true and is used to indicate that SQO and SQC instruction is enabled to active.
The number of steps of the sequencer file starting at position 1
The word location or step in the sequencer file from/to which the instruction moves data
SQO instruction operation during the first scan
o If the rung is true at the time of the first scan and the position parameter is 0, then the data in the memory location at position 0 is transferred through the mask to the destination register and the position pointer is incremented by 1.
o If the rung is false at the time of the first scan and the position parameter is 0, then the data in the memory location at position 0 is NOT transferred to the destination register and the position pointer is NOT incremented.