Convert to BCD (TO_BCD)

The Convert to BCD (TO_BCD) instruction converts a decimal value (0 Source 99,999,999) to a BCD value and stores the result in the Destination. BCD is the Binary Coded Decimal number system that expresses individual decimal digits (0-9) in a 4-bit binary notation.
Source
Destination
Destination Type
Negative source < 0
0
Source > 9,999, 999,999, 999,999
16#9999_9999_9999_9999
ULINT
Source > 9,999, 999,999, 999,999
16#9999_9999_9999_9999
LINT
Source > 99,999,999
16#9999_9999
UDINT
Source > 99,999,999
16#9999_9999
DINT
Source > 99,999,999
16#9999
UINT
Source > 99,999,999
16#9999
INT
Source > 99,999,999
16#99
USINT
Source > 99,999,999
16#99
SINT
Available Languages
Ladder Diagram
Operands
IMPORTANT: Unexpected operation may occur if:
  • Output tag operands are overwritten
  • Members of a structure operand are overwritten
  • Except when specified, structure operands are shared by multiple instructions.
There are data conversion rules for mixing numeric data types within an instruction. See Data conversions.
Ladder Diagram
Operand
Data Type
Format
Description
Source
SINT
INT
DINT
LINT
USINT
UINT
UDINT
ULINT
Immediate
tag
Value to convert to BCD
Destination
SINT
INT
DINT
LINT
USINT
UINT
UDINT
ULINT
tag
Tag to store the result
Affects Math Status Flags
Conditional. See Math status flags.
Major/Minor Faults
A minor fault will occur if:
Fault type
Fault code
feature is enabled and overflow detected and Source < 0
4
4
feature is enabled and overflow detected and Source > 99,999,999 / 9,999, 999,999, 999,999
4
4
feature is enabled and overflow detected
4
4
Execution
Ladder Diagram
Condition/State
Action Taken
Prescan
N/A.
Rung-condition-in is false
N/A.
Rung-condition-in is true
The controller converts the Source to BCD and places the result in the Destination.
Postscan
N/A.
Example
Ladder Diagram
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