Mitsubishi 00JCPU, Руководство пользователя

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CHAPTER6 FUNCTIONS
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6.2 C
onsta
nt Scan
(5) Constant scan accuracy
Table6.3 shows the constant scan accuracy.
•
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.
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
CPU module
Without
monitor,
without user
interrupt
With monitor,
without user
interrupt
Without monitor, with user
interrupt
With monitor, with user
interrupt
Q00JCPU 0.20ms 0.90ms
Interrupt program execution
time (refer to Section
10.1.2(4)(a))
Total of the following:
1) Time given under the "With
monitor, without user
interrupt" column
2)Total of interrupt program
execution times
Q00CPU 0.12ms 0.60ms
Q01CPU 0.10ms 0.50ms
Q02CPU 0.02ms
High Performance model QCPU,
Process CPU, Redundant CPU
0.01ms