Siemens SIMATIC S7 System Manual page 237

LAD / FBD STL
ROUND
TRUNC
SEG
Non-fatal error conditions with ENO = 0
0006H Indirect address
•
SM1.1 Overflow
•
SM1.6 Invalid BCD
•
Input / output Data type
IN BYTE
WORD (BCD_I,
I_BCD), INT
DINT
REAL
OUT BYTE
WORD (BCD_I,
I_BCD)
INT (B_I, DI_I)
DINT, REAL
S7-200 SMART
System Manual, V2.3, 07/2017, A5E03822230-AF
Description
IN, OUT
Round:
Convert the 32-bit real-number value IN to a double integer value and place the
rounded result at the address assigned to OUT. If the fraction portion is 0.5 or
greater, the number is rounded up.
Truncate:
IN, OUT
Convert the 32-bit real-number value IN into a double integer value and place
the result at the address assigned to OUT. Only the whole number portion of
the real number is converted, and the fraction is discarded.
Note: If the value that you are converting is not a valid real number or is too
large to be represented in the output, then the overflow bit is set and the output
is not affected.
IN, OUT
SEG:
To illuminate the segments of a seven-segment display, the Segment instruc-
tion converts the character byte specified by IN to generate a bit pattern byte at
the address assigned to OUT.
The illuminated segments represent the character in the least significant digit of
the input byte.
SM bits affected
SM1.1 Overflow
•
SM1.6 Invalid BCD
•
Operand
IB, QB, VB, MB, SMB, SB, LB, AC, *VD, *LD, *AC, Constant
IW, QW, VW, MW, SMW, SW, T, C, LW, AIW, AC, *VD, *LD, *AC, Constant
ID, QD, VD, MD, SMD, SD, LD, HC, AC, *VD, *LD, *AC, Constant
ID, QD, VD, MD, SMD, SD, LD, AC, *VD, *LD, *AC, Constant
IB, QB, VB, MB, SMB, SB, LB, AC, *VD, *LD, *AC
IW, QW, VW, MW, SMW, SW, T, C, LW, AC, *VD, *LD, *AC
IW, QW, VW, MW, SMW, SW, T, C, LW, AC,, AQW, *VD, *LD, *AC
ID, QD, VD, MD, SMD, SD, LD, AC, *VD, *LD, *AC
Program instructions
7.5 Convert
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