Mitsubishi MELSEC Q Series Programming Manual

3-10
1. The CPU module floating decimal point data can be monitored using the
monitoring function of a peripheral device.
2. When floating-point data is used to express 0, all data in the following range are
turned to 0.
(a) Single-precision floating-point data: b0 to b31
(b) Double-precision floating-point data: b0 to b63
3. The setting range of floating decimal point data is as follows. *
1
(a) Single-precision floating-point data
2
128
< Device data 2
-126
, 0, 2
-126
Device data < 2
128
(b) Double-precision floating-point data
2
1024
< Device data 2
-1022
,0,2
-1022
Device data < 2
1024
4. Do not specify 0 in floating-point data (only when the most significant bit of
the floating-point real number is 1). (An operation error will occur if
floating-point operation is performed with 0.)
When 0 is specified, the following CPU module internally converts the value
to 0 to perform a floating-point operation. Therefore an operation error does not
occur.
• The High Performance model QCPU with the internal processing set to
"double precision". *
2
(Double precision is set by default for the floating-
point operation processing.)
When 0 is specified, the following CPU module performs a floating-point
operation with 0, keeping its processing speed. Therefore an operation error
occurs.
• Basic model QCPU *
3
• High Performance model QCPU where internal operation is set to single
precision *
2
• Process CPU
• Redundant CPU
• Universal model QCPU
•LCPU
*1: For operations when a real number is out of range and operations when an invalid value is input, refer to the
QnUCPU User's Manual (Function Explanation, Program Fundamentals) or Qn(H)/QnPH/QnPRHCPU
User's Manual (Function Explanation, Program Fundamentals).
*2: Switch between single precision and double precision of the internal operation of floating-point operation in
the PLC system of the PLC parameter dialog box. For the single precision and double precision of floating-
point operation, refer to the QnUCPU User's Manual (Function Explanation, Program Fundamentals) or
Qn(H)/QnPH/QnPRHCPU User's Manual (Function Explanation, Program Fundamentals).
*3: The Basic model QCPU can perform floating-point operation if its first five digits of serial No. are "04122 or
later".

Mitsubishi MELSEC Q Series Specifications

General

Brand	Mitsubishi
Model	MELSEC Q Series
Category	Controller
Language	English