Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 52

The monitor function of the engineering tool can monitor real number data of CPU modules.
To represent "0" in real number data, set all numbers in each of the following range to 0.
• Single-precision real number data: b0 to b31
• Double-precision real number data: b0 to b63
The setting range of real number data is as follows.
• Single-precision real number data: -2
precision real number data]<2
• Double-precision real number data: -2
precision real number data]<2
Do not specify "-0" (only the most significant bit is 1) in real number data. Performing a real number operation
using -0 results in an operation error.
*1 For the operations to be performed when an overflow or underflow occurs or when a special value is input, refer to the following.
 MELSEC iQ-R CPU Module User's Manual (Application)
1 OVERVIEW
50
1.2 Data Specification Method
*1
128
<[single-precision real number data]-2
128
1024
<[double-precision real number data]-2
1024
-126 -126
[single-
, 0, 2
-1022 -1022
[double-
, 0, 2