Mitsubishi QCPU (Q Mode) User Manual

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MELSEC-Q
11 HIGH PERFORMANCE MODEL QCPU PROCESSING TIME
(8) File register
File register requires additional processing time. Add the processing time of file
registers to the total processing time.
CPU Type Processing Time
Q02CPU 1.03 ms
Standard RAM
Q02HCPU, Q06HCPU, Q12HCPU, Q25HCPU 0.41 ms
Q02CPU 0.94+0.2 n ms
SRAM Card
Q02HCPU, Q06HCPU, Q12HCPU, Q25HCPU 0.40+0.1
n ms
Conditions n: number of program files
11.3 Factors Responsible for Shortened Scan Time
The length of scan time can be shorted by making changes to the PLC Parameter
setting as follows:
• A-PLC (Compatibility with A-Series CPU)
• Arithmetic operation of floating-point
(1) A-PLC (Compatibility with A-Series CPU)
When "Use special relay/special register after SM1000/SD1000" is set in the PLC
system settings of the PLC parameter, the scan time can be reduced by the
value in the following table by setting to "Do not use special relay/special register
after SM1000/SD1000."
In this case, the A-series compatible special relays/special registers
SM1000/SD1000 to SM1299/SD1999 must be replaced with the Q-series
dedicated special relays/special registers SM0/SD0 to SM999/SD999.
CPU Type Processing Time
Q02CPU 0.07 ms
Q02HCPU, Q06HCPU, Q12HCPU, Q25HCPU 0.03 ms
(2) Arithmetic operation of floating-points
By default, the "Perform internal arithmetic operations in double precision" check
box in the PLC System sheet of the PLC Parameter dialog box is on. Turning off
the check box will increase the processing speed of executing an instruction that
includes a floating-point.
For details on floating-point arithmetic operation, see the QCPU (Q
Mode)/QnACPU Programming Manual (Common Instructions).

Mitsubishi QCPU (Q Mode) Specifications

General

Brand	Mitsubishi
Model	QCPU (Q Mode)
Category	Controller
Language	English