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Conversion Instructions Section 3-12
Description NEGL(161) calculates the 2’s complement of S+1 and S and writes the result
to R+1 and R. The 2’s complement calculation basically reverses the status of
the bits in S+1 and S and adds 1.
Note This operation (reversing the status of the bits and adding 1) is equivalent to
subtracting the content of S+1 and S from 0000 0000.
Flags
Note The result for 8000 hex will be 8000 hex.
Example When CIO 000000 is ON in the following example, NEGL(161) calculates the
2’s complement of the content of D00101 and D00100 and writes the result to
D00201 and D00200.
3-12-7 16-BIT TO 32-BIT SIGNED BINARY: SIGN(600)
Purpose Expands a 16-bit signed binary value to its 32-bit equivalent.
Ladder Symbol
Variations
(S+1, S) (R+1, R)
2's complement
(Complement + 1)
Name Label Operation
Error Flag ER OFF
Equals Flag = ON if the result is 0000 0000.
OFF in all other cases.
Negative Flag N ON if bit 15 of R+1 is ON.
OFF in all other cases.
−)
Add 1
Actual
calculation
Equivalent
subtraction
Reverse bit status
SIGN(600)
S
R
S: Source word
R: First result word
Variations Executed Each Cycle for ON Condition SIGN(600)
Executed Once for Upward Differentiation @SIGN(600)
Executed Once for Downward Differentiation Not supported
Immediate Refreshing Specification Not supported
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