Floating Point Band Comparisons (Single Precision) - Mitsubishi Electric MELSEC-Q/L Programming Manual

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Floating point band comparisons (single precision)

• QnUDVCPU, LCPU: The serial number (first five digits) is "16112" or later.

(S1): Start number of the devices where the lower limit value is stored (real number)

(S2): Start number of the devices where the upper limit value is stored (real number)

(S3): Data to be compared or start number of the device where the data to be compared is stored (real number)

(D): Start bit device number to which the comparison result is output (Bit)

Internal device

Processing details

• One of (D), (D)+1, and (D)+2 turns on depending on the results (small, within the band, large) after the lower limit values

"(S1) and (S1)+1" and the upper limit values "(S2) and (S2)+1" are compared with the comparison data "(S3) and (S3)+1".

• When the contact turns off, "(D) to (D)+2" hold the conditions immediately before the contact turns on and off.

• The three points starting from the device specified by (D) are used. Therefore, do not overlap any device used by others.

• Set values smaller than the upper limit values (S2), (S2)+1 as the lower limit values (S1), (S1)+1. If the lower limit values

(S1), (S1)+1 are larger than the upper limit values (S2), (S2)+1, the upper limit values (S2), (S2)+1 will be handled as the

same values as the lower limit values (S1), (S1)+1.

Operation error

• In any of the following cases, an operation error occurs, the error flag (SM0) turns on, and an error code is stored in SD0.

Error details

The range of three points from the device specified by (D) exceeds the range

of the corresponding device.

The specified device value is -0, a subnormal number, NaN (not a number),

6 BASIC INSTRUCTIONS

6.1 Comparison Operation Instructions

Turns on when

Turns on when

Turns on when