Rockwell Automation 1336T Function Block Prog. Manual, Series A/B - Manual (Page 78)

Function Block Library 4–16
1336 FORCE — 5.9 August 1995
DOUBLE WORD VALUES
Both the Most Significant Word and the Least Significant Word are
interpreted together by the function algorithm as one word when
using 32 bit values. The range of a double word value is
±
2,147,483,647. The range of the more common, signed single-word
16 bit node is
±
32767.
31 16 15 0
Most Significant Word Least Significant Word
Node 1 Node 0
Bit 31 is the sign bit, the most significant bit for 32 bit values. For 16
bit values, bit 15 (the sign bit) is the most significant bit.
EXAMPLES EXAMPLE 1 EXAMPLE 2 Example 3 Example 4
LSW In 15 20 65535 65511
MSW In 0 0 2 – 1
INPUT VALUE 15 20 196607 – 25
Div 4 0 42 5
Output 3 0 4681 – 5
Example 3 — Double Word Input Value = + 196607
dec
= 0002 FFFF
hex
2
dec
65535
dec
0002
hex
FFFF
hex
Most Significant Word
Node 1
Least Significant Word
Node 0
Example 4 — Double Word Input Value = – 25
dec
= FFFF FFE7
hex
– 1
dec
65511
dec
FFFF
hex
FFE7
hex
Most Significant Word
Node 1
Least Significant Word
Node 0
DIVIDE
(continued)