Mitsubishi Electric M800VW Series Programming Manual page 364

Plc programming

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M800V/M80V Series PLC Programming Manual (1/2)

8 Function Instructions

8.10 Character String Processing Instructions

 Operation errors

 In the following cases, an arithmetic error occurs, the error flag (SM0) turns ON, and an error code is stored at SD0.

- The improper data as shown below, which cannot be converted into (S), have been set. (Error code: 34)

- Characters other than "30H" (0) to "39H" (9) exist in the integer part or decimal part.

- Two or more "2EH"(.) exist in the character string.

- Characters other than "45H" (E), "65H" (e), "2BH" (+), and "2DH" (-) exist in the character string.

- Multiple exponents of "45H" (E) and "65H" (e) exist in the character string.

- Three or more numeric value digits are described in the exponent part of the character string.

- Multiple signs exist in the exponent part ("2BH"(+) and "2DH(-)") of the character string.

- Multiple signs ("2BH"(+) and "2DH(-)") exist in the positive number part of the character string in decimal format, or

in the mantissa part of the character string in exponential format.

- The number of characters at (S) or after is 0 or exceeds 24 characters. (Error code: 34)

- The NULL code "00H" does not exist in the relevant device range starting from the device number designated by (S).

(Error code: 82)

- The operation result exceeds the following range. (When an overflow occurs) (Error code: 36)

 Program example

 The following program converts the character string stored in the area starting from R0 to a 32-bit floating-point real num-

ber, and stores the result at D0 and D1 when X20 turns ON.

[Ladder mode]

IB-1501667-B

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