Rosemount 848L
Reference Manual
Table D-1. Supported Functions
| Required number | Maximum number |
| Maximum |
Function Name | of parameters | of parameters | Function Description | Instances |
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AND | 2 | 10 | AND (a, b,...); | NO LIMIT |
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| This function's result will be the logical and of a, b,... |
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CLOCK | 2 | 2 | CLOCK (onTime, offTime); | 10 |
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| This function is a periodic clock. The result of this |
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| function will be true for 'onTime' * 100 milliseconds, |
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| then false for 'offTime' * 100 milliseconds, and repeats |
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| forever. |
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CTU | 3 | 3 | CTU (clock, reset, count); | 20 |
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| This function is an UP COUNTER. When 'reset' is true, |
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| this function will set its' internal counter to 0. When |
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| 'reset' is false, this function will increment its' internal |
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| counter each time 'clock' has a rising edge, until the |
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| counter reaches 'count'. The result of this function will |
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| be true when the counter reaches 'count', and false |
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| otherwise. |
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DO | 1 | 1 | DO (channel number); | NO LIMIT |
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| This function's result will be the value of the requested |
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| external channel value coming into this device via a DO |
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| function block. |
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EQ | 1 | 1 | EQ (channel number); | NO LIMIT |
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| This function's result will be the value of the requested |
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| equation result. |
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| Note: The equation values are processed in order from |
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| the first equation to the last, so if equation 4 asks for |
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| equation 20 value, the equation 20 value will be the |
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| value calculated in the previous run time cycle. |
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FALL | 1 | 1 | FALL (a); | 10 |
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| This function is a falling edge trigger. When 'a' |
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| transitions from true to false, this function's result is |
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| true, otherwise it is false. |
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ICF | 1 | 1 | ICF (channel number); | NO LIMIT |
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| This function's result will be true for one execution |
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| cycle, if the value of the requested device input has had |
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| at least one falling transition since the last execution |
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| cycle. This is ideal for capturing events that occur faster |
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| then the logic execution cycle. |
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ICR | 1 | 1 | ICR (channel number); | NO LIMIT |
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| This function's result will be true for one execution |
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| cycle, if the value of the requested device input has had |
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| at least one rising transition since the last execution |
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| cycle. This is ideal for capturing events that occur faster |
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| then the logic execution cycle. |
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IN | 1 | 1 | IN (channel number); | NO LIMIT |
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| This function's result will be the value of the requested |
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| device input. |
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NOT | 1 | 1 | NOT (a); | NO LIMIT |
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| This function's result will be the logical not of a. |
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OR | 2 | 10 | OR (a, b,...); | NO LIMIT |
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| This function's result will be the logical or of a, b,... |
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OUT | 1 | 1 | OUT (channel number); | NO LIMIT |
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| This function's result will be the value of the requested |
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| device output. |
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