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| Parameter | Enter |
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| & Data Type |
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| FunctOp | The FunctOp is used to determine the result that will be returned by the |
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| Constant | SW8A. |
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| Numeric | Function |
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| Code |
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| 0 | Returns the state of the signal at the time the instruction is |
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| executed. A 0 is stored for low and a 1 is stored for high. |
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| 1 | Returns the duty cycle of the signal. The result is the |
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| percentage of time the signal is high during the scan interval. |
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| 2 | Returns a count of the number of positive transitions of the |
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| signal. |
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| 3 | Returns a value indicating the condition of the module: |
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| positive integer: |
| ROM and RAM are good |
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| negative value: |
| RAM is bad |
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| Zero: |
| ROM is bad |
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| StartChan | The first | channel that should be read on the SW8A. If the Reps parameter is |
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| Constant | greater than 1, measurements will be made on sequential channels. |
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| Mult, Offset | A multiplier and offset by which to scale the raw results of the measurement. See |
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| Constant, | the measurement description for the units of the raw result; a multiplier of one and an |
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| Variable, | offset of 0 are necessary to output in the raw units. For example, the TCDiff |
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| Array, or | instruction measures a thermocouple and outputs temperature in degrees C. A |
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| Expression | multiplier of 1.8 and an offset of 32 will convert the temperature to degrees F. |
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6.2 Edlog Programming
Instruction 102, Table 5, is used to address and retrieve information from the
SW8A.
TABLE 5. Instruction 102 -
Parameter | Data |
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Number | Type | Description |
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01: | 2 | Repetitions |
02: | 2 | Module Address (00..33) |
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03: | 2 | Function Option (0=State, 1=Duty 2=Counts, |
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| 3=Signature) |
04: | 2 | |
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05: | 4 | Starting input location for results |
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06: | FP | Mult |
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07: | FP | Offset |
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7