Mitsubishi 00JCPU User Manual page 187

(5) Constant scan accuracy
Table6.3 shows the constant scan accuracy.
CPU module
Q00JCPU
Q00CPU
Q01CPU
Q02CPU
High Performance model QCPU,
Process CPU, Redundant CPU
However, when any program indicated below is being executed, the constant scan time may increase.
(a) Low-speed execution type program
There is a waiting time of 0.5ms.
• When maximum processing time of one instruction is within 0.5ms
A constant scan error will be the same as the constant scan accuracy shown in Table6.3.
• When maximum processing time of one instruction exceeds 0.5ms
The constant scan time may increase by the time exceeding 0.5ms.
Also, the CPU module detects "PRG, TIME OVER" (error code: 5010).
For the maximum processing time of one instruction, refer to the following.
MELSEC-Q/L Programming Manual (Common Instruction)
(b) Interrupt program or fixed scan execution type program
Interrupts are disabled while an interrupt program or fixed scan execution type program is executed.
Even if the constant scan time runs out during execution of an interrupt program or fixed scan execution type
program, the constant scan cannot be finished.
In this case, the constant scan time may increase by the execution time of the program executed.
Table6.3 Constant scan accuracy
Without
With monitor,
monitor,
without user
without user
interrupt
interrupt
0.20ms 0.90ms
0.12ms 0.60ms
0.10ms 0.50ms
•
With monitor: Indicates the status where monitor operation is performed by GX Developer connected or
communication with an external device is performed using the serial communication
function.
•
Without monitor: Indicates the status where no operation by GX Developer or no communication using
the serial communication function is performed.
Without monitor, with user
interrupt
Interrupt program execution
time (refer to Section
10.1.2(4)(a))
0.02ms
0.01ms
CHAPTER6 FUNCTIONS
With monitor, with user
interrupt
Total of the following:
1) Time given under the "With
monitor, without user
interrupt" column
2)Total of interrupt program
execution times
6 - 7
1
2
3
4
5
6
7
8