Campbell Scientific CR1000KD CR1000 Measurement and Control System - Page 429
As LONG, Table 111., Math Expressions and CRBasic, Results, Table 112.
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Section 10. Troubleshooting 10.3.4.2 Floating-Point Math, NAN, and ±INF Table Math Expressions and CRBasic Results (p. 429) lists math expressions, their CRBasic form, and IEEE floating point-math result loaded into variables declared as FLOAT or STRING. 10.3.4.3 Data Types, NAN, and ±INF NAN and ±INF are presented differently depending on the declared-variable data type. Further, they are recorded differently depending on the final-storage data type chosen compounded with the declared-variable data type used as the source (table Variable and FS Data Types with NAN and ±INF (p. 429) ). For example, INF in a variable declared As LONG is represented by the integer -2147483648. When that variable is used as the source, the final-storage word when sampled as UINT2 is stored as 0. Table 111. Math Expressions and CRBasic Results Expression CRBasic Expression Result 0 / 0 0 / 0 NAN ∞ - ∞ (-1) ∞ (1 / 0) - (1 / 0) -1 ^ (1 / 0) NAN NAN 0 * -∞ 0 * (-1 * (1 / 0)) NAN 1∞ (1 / 0) / (1 / 0) 1 ^ (1 / 0) NAN NAN 0 * ∞ 0 * (1 / 0) NAN x / 0 1 / 0 INF x / -0 1 / -0 INF -x / 0 -1 / 0 -INF -x / -0 ∞0 0∞ 00 -1 / -0 (1 / 0) ^ 0 0 ^ (1 / 0) 0 ^ 0 -INF INF 0 1 Table 112. Variable and FS Data Types with NAN and ±INF Final-Storage Data Type & Associated Stored Values Variable Test Public / Dim Type Expressio Variables FP2 n IEEE4 UINT2 UNIT4 STRING BOOL BOOL8 LONG As FLOAT 1 / 0 INF INF1 INF1 655352 4294967295 +INF TRUE TRUE 2,147,483,647 0 / 0 NAN NAN NAN 0 2147483648 NAN TRUE TRUE -2,147,483,648 As LONG 1 / 0 2,147,483,647 7999 2.147484E09 65535 2147483647 2147483647 TRUE TRUE 2,147,483,647 429
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