Deck 16: Sequencers

Question 1

The sequencer instruction transfers information from memory words into output words.

Answer 1

True

Question 2

The Mask is a(n) ____________________ through which all data from the sequencer file must pass before being placed into the destination, or output word.

Answer 2

filter

Question 3

Explain the found bit (FD) of the Sequencer Compare Instruction (SQC).

Answer 3

When the status of all non-masked bits in the source address matches the reference word bits, bit 08 is set to 1.

Question 4

Some PLCs allow the data to be entered using hexadecimal, which speeds the entry process.

Question 5

To prevent the sequencer from controlling certain bits of an output word, a(n) ____________________ word is used.

Question 6

A programmed sequencer replaces the mechanical ___________________ sequencer that was used in the past.

Question 7

Explain the potential use of the SQC instruction for diagnostics.

Question 8

Allen-Bradley uses a hexadecimal number that represents the bit pattern that is desired by the mask for screening information, or data, from the sequencer file.

Question 9

The Done Bit (DN) is set when the last word of the sequencer file has been transferred into the destination word.

Question 10

Explain which instruction may be used in place of a dedicate sequencer instruction.

Question 11

The status bits for the SQC instruction are exactly the same as the ____________________ instruction.

Question 12

An SQM instruction allows data to be loaded into a sequencer file from a source address on each false-to-true transition.

Question 13

Explain the Position status word.

Question 14

The maximum length of the sequencer file for a PCL-5 is 1-____________________.

Question 15

Explain the function of a sequencer.