ABB i-bus KNX AC/S 1.x.1 Series - Page 104

ABB i-bus
®
KNX
Parameters
104 2CDC508198D0211 Rev. A | AC/S 1.x.1
Subtraction (SUB)
Subtracts one input value (subtrahend) from another (minuend).
Inputs
No.
DPT
Abbr.
Name
Visible
Description
1
8 bits 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
Ü
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 value from the subtraction is outside the DPT range:
• If the value from the subtraction is greater than the maximum DPT value:
o D = 0
o Ü = 1 (true)
• If the value from the subtraction is less than the minimum DPT value:
o D = 0
o Ü = 1 (true)
• If the value from the subtraction is within the valid range of the DPT:
o D = Difference between the two input values (minuend - subtrahend)
o Ü = 0 (false)
Other
Inputs not connected are treated as if they did not exist and are set to 0.