Watlow D4T Data Logger
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Chapter 5 Function Reference
Tolerance
Use Tolerance to set how precisely A and B must match to be considered equal. For example,
with Tolerance set to 2, the values 10 and 12 are considered equal, but 10 and 12.5 are not.
Range: 0 to 99,999
Error Handling
When an error exists on any receiver the function cannot definitively determine the result of
the comparison and an error will be generated. Use Error Handling to select the output's value
and error status.
Options:
• True Good
: outputs value is true (on) with no error
• True Bad
: outputs value is true (on) and has an error
• False Good
: outputs value is false (off) with no error
• False Bad
: outputs value is false (off) and has an error
Compare Errors
Error Condition
Result
Either or both inputs are in an error
state.
The output will be set according to the selections
made for error handling described above.
Counter
Use a counter to set an output when a digital signal’s state changes a given number of times.
A counter can count up or down from the load value. Its output turns on when the count
equals the target value. The output turns off and the count is set equal to the load value
when the reset signal is received.
This block is found in the Function Block Diagram editor’s Library when working with a data
logger that offers the Counter block. The number of these blocks that are available is shown
within the parenthesis.
Choose whether the counter counts up or down with the Function parameter. These options
for Function are described in detail in the following sections:
: Count is incremented by the CNT input.
: Count is decremented by the CNT input.
UP
This function counts up from the load value. The count is incremented by applying a signal to
CNT. OUT turns on when the count equals the target value. OUT turns off and the count is set
equal to the load value by RST (reset).
Signals
Direction
Label
Type
Function
Receivers
CNT
Digital Increments the count
RST
Digital Resets the count to the load value
Transmitters OUT
Digital On when the count equals the target value
