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XOR
Description
Provides an up to 8-input XOR algorithm, meaning it performs the exclusive OR function. Each input (IN [1], IN [2], ...,
IN [8]) has the capability of being optionally inverted, if required.
Function
Turns output (OUT) ON only if an odd number of inputs are ON; otherwise, OUT is OFF.
Truth Table
IN [1]
OFF
ON
OFF
ON
Inputs
IN [1..8] = Boolean value
Outputs
OUT = Boolean value controlled by the status of input signals.
Parameters
IN [1..8]
INPTINVSTS [1..8]
Regulatory Control Blocks
AUTOMAN (Auto Manual)
Description
Applies a user-specified gain and bias as well as a calculated bias (OPBIAS.FLOAT) to the output. The user-specified
values can be fixed or external. A fixed value is stored manually or by a program, and an external value is brought from
another function block.
Function
Provides control initialization and override feedback processing. Typically used either:
• in cascade control strategy where an upstream block may not accept an initialization request from its secondary,
• between FANOUT block and a final control element to provide "bumpless" output on return to cascade.
Timeout
In cascade mode, performs timeout monitoring on the input (X1). If the X1 value is not updated within a predefined
Monitoring
time, this block invokes the following timeout processing:
1. Sets the "input timeout" flag (TMOUTFL).
2. Sets the input value to Bad (NaN).
3. Requests the X1 primary to initialize.
This block does not support mode shedding on timeout.
Inputs
X1 = initializable input which must come from another function block; an operator cannot set it.
XEUHI and XEULO define the full range of X1:
XEUHI is the value that represents 100% of full scale.
XEULO is the value that represents 0% of full scale.
Outputs
Block has following initializable outputs:
OP = Calculated output in percent.
OPEU = Calculated output in engineering units
Note that the default OP connection pin is exposed on the blocks and the implicit/hidden connection function
automatically makes the appropriate value/status parameter (OPX/OPEUX) connection when required.
More on following page
Spare Allen-Bradley Parts
IN [2]
OFF
OFF
ON
ON
OUT
OFF
ON
ON
OFF
ORDERINCM
OUT
Publication 1757-RM810A-EN-P - May 2002
Functional Blocks
3-31
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