ABB i-bus KNX ABA/S 1.2.1 - Subtraction (SUB)

ABB i-bus
®
KNX
Parameters
ABA/S 1.2.1 | 2CDC509086D0201 67
7.10.23 Subtraction (SUB)
Description
Subtracts one input value (Subtrahend) from another (Minuend).
Inputs
No. DPT Abbr. Name Visible Description
1 8 bit or higher M Minuend Always
2 Same as Input 1 S Subtrahend Always
Outputs
No. DPT Abbr. Name Visible Description
1 Same as Input 1 D Difference Always
2 1 bit Ov Overflow Always Indicates an overflow
Parameters
None
Function
Whenever a telegram is received the output starts a recalculation independently if the value has changed.
An overflow will occur if the Subtraction value is outside the DPT range:
• If the Subtraction value is greater than the maximum DPT value:
o D = 0
o Ov = 1 (true)
• If the Subtraction value is less than the minimum DPT value:
o D = 0
o Ov = 1 (true)
• If the Subtraction value is within the valid range of the DPT:
o D = Difference between the two input values (Minuend - Subtrahend)
o Ov = 0 (false)
Other
Unlinked inputs are treated as if they did not exist and are set to 0.