Selected Summer (SSUM)

Operand	Type	Format	Description
SSUM tag	SELECTED_SUMMER	Structure	SSUM structure

Input Parameter	Data Type	Description
EnableIn	BOOL	Enable input. If false, the instruction does not execute and outputs are not updated. Default is true.
In1	REAL	The first input to be summed. Valid = any float Default = 0.0
Gain1	REAL	Gain for the first input. Valid = any float Default = 1.0
Select1	BOOL	Selector signal for the first input. Default is false.
In2	REAL	The second input to be summed. Valid = any float Default = 0.0
Gain2	REAL	Gain for the second input. Valid = any float Default = 1.0
Select2	BOOL	Selector signal for the second input. Default is false.
In3	REAL	The third input to be summed. Valid = any float Default = 0.0
Gain3	REAL	Gain for the third input. Valid = any float Default = 1.0
Select3	BOOL	Selector signal for the third input. Default is false.
In4	REAL	The fourth input to be summed. Valid = any float Default = 0.0
Gain4	REAL	Gain for the fourth input. Valid = any float Default = 1.0
Select4	BOOL	Selector signal for the fourth input. Default is false.
In5	REAL	The fifth input to be summed. Valid = any float Default = 0.0
Gain5	REAL	Gain for the fifth input. Valid = any float Default = 1.0
Select5	BOOL	Selector signal for the fifth input. Default is false.
In6	REAL	The sixth input to be summed. Valid = any float Default = 0.0
Gain6	REAL	Gain for the sixth input. Valid = any float Default = 1.0
Select6	BOOL	Selector signal for the sixth input. Default is false.
In7	REAL	The seventh input to be summed. Valid = any float Default = 0.0
Gain7	REAL	Gain for the seventh input. Valid = any float Default = 1.0
Select7	BOOL	Selector signal for the seventh input. Default is false.
In8	REAL	The eighth input to be summed. Valid = any float Default = 0.0
Gain8	REAL	Gain for the eighth input. Valid = any float Default = 1.0
Select8	BOOL	Selector signal for the eighth input. Default is false.
Bias	REAL	Bias signal input. The instruction adds the Bias to the sum of the inputs. Valid = any float Default = 0.0

Output Parameter	Data Type	Description
EnableOut	BOOL	Indicates if instruction is enabled. Cleared to false if Out overflows.
Out	REAL	The calculated output of the algorithm.

Operand	Type	Format	Description
SSUM tag	SELECTED_SUMMER	Structure	SSUM structure

Condition	Action
No In is selected	Out = Bias
One or more In are selected	For all n where Selectn is true Out = ∑ (In n x Gain n ) + Bias

Condition/State	Action Taken
Prescan	EnableIn and EnableOut bits are cleared to false.
Tag.EnableIn is false	EnableIn and EnableOut bits are cleared to false.
Tag.EnableIn is true	EnableIn and EnableOut bits are set to true. The instruction executes.
Instruction first run	N/A
Instruction first scan	N/A
Postscan	EnableIn and EnableOut bits are cleared to false.

Condition/State	Action Taken
Prescan	See Prescan in the Function Block table.
Normal Execution	See Tag.EnableIn is true in the Function Block table.
Postscan	See Postscan in the Function Block table.