Siemens Simatic S7-300 Service Manual download pdf (Page 43)

Statement List (STL) for S7-300 and S7-400 Programming

A5E00706960-01

3-1

3 Conversion Instructions

3.1 Overview of Conversion Instructions

Description

You can use the following instructions to convert binary coded decimal numbers and

integers to other types of numbers:

• BTI BCD to Integer (16-Bit)

• ITB Integer (16-Bit) to BCD

• BTD BCD to Integer (32-Bit)

• ITD Integer (16-Bit) to Double Integer (32-Bit)

• DTB Double Integer (32-Bit) to BCD

• DTR Double Integer (32-Bit) to Floating-Point (32-Bit IEEE-FP)

You can use one of the following instructions to form the complement of an integer or

to invert the sign of a floating-point number:

• INVI Ones Complement Integer (16-Bit)

• INVD Ones Complement Double Integer (32-Bit)

• NEGI Twos Complement Integer (16-Bit)

• NEGD Twos Complement Double Integer (32-Bit)

• NEGR Negate Floating-Point Number (32-Bit, IEEE-FP)

You can use the following Change Bit Sequence in Accumulator 1 instructions to

reverse the order of bytes in the low word of accumulator 1 or in the entire

accumulator:

• CAW Change Byte Sequence in ACCU 1-L (16-Bit)

• CAD Change Byte Sequence in ACCU 1 (32-Bit)

You can use any of the following instructions to convert a 32-bit IEEE floating-point

number in accumulator 1 to a 32-bit integer (double integer). The individual

instructions differ in their method of rounding:

• RND Round

• TRUNC Truncate

• RND+ Round to Upper Double Integer

• RND- Round to Lower Double Integer

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Siemens Simatic S7-300 Service Manual Page 43