Deck 16: Data-Handling Instructions

Question 1

In reference to the MVM instruction, the filtering device which determines bit by bit whether a copy of the bit will be allowed to move from the source to the destination is called the ____________________.

Answer 1

mask

Question 2

Briefly describe the three operating modes of the Swap Byte instruction.

Answer 2

The Swap Byte instruction has three operating modes:
1. Word Mode: swaps the upper and lower word of a DINT
2. High/Low Mode: swaps the upper and lower bytes in each word
3. Reverse Mode: reverses the order of the bytes contained in the DINT.

Question 3

List the four status bits used with the Masked Move instruction.

Answer 3

Masked Move instruction status bits include:
• Carry bit
• Overflow bit
• 0 bit
• Sign bit

Question 4

In reference to the Masked Move instruction, list three mask rules.

Question 5

The instruction that extracts the desired data and shifts, or redistributes, the bits to the correct location is the ____________________ instruction.

Question 6

To avoid errors when using the Fill File instruction, the Source and Destination data types should always be the same data type.

Question 7

The Masked Move instruction selects specific bits from an INT or DINT source and extracts only those bits by moving them through a filter to the destination tag.

Question 8

Attempting to read from or write to an array element that does not exist is referred to as an array subscript error and results in a(n) ____________________ fault on the controller.

Question 9

When determining the source bit parameter of the BTD instruction, remember to start counting at the left and start with bit number 0.

Question 10

Briefly describe the three parameters associated with the Copy instruction.

Question 11

The Move instruction moves the source data to the destination and then deletes the source data.

Question 12

Suppose a Move instruction involves a destination result too large to fit in the destination tag. This would cause the ____________________ bit to be set.

Question 13

What is the difference between a Move instruction and a Copy instruction?

Question 14

When configuring the network, the programmer has options as to the data size and where the data will be stored in the controller scoped tags collection. The determination as to where and how the network I/O data are stored in the controller is referred to as ____________________.

Question 15

The destination data type used with the Clear instruction must be either SINT or DINT.