Hi,
I am newby in plc programming. I have doubts about influence on Fixed scan program on CPU work. I have Melsec FX5U PLC controller and I have recently experimented with fixed scan program. I have created FC block and in case of execution function in Main Program (without interrupt), PLC cycle time was about 3 ms (max. cycle time - about 5ms).
The same function I have move from Main Program to Fixed Scan. In case of intterrupt 5 and 6ms the cycle time was as in the first case - about 3 ms (max. cycle time - about 5ms). In case of interrupt 4ms or less the cycle time was about 29ms and max. cycle time - 70ms.
It's quite consistent, but I have doubt if CPU will work properly in case of fixed scan program with interrupt cycle time lower than necessary time to execute the same program without interrupt.
Thank you in advance for answers!
I am newby in plc programming. I have doubts about influence on Fixed scan program on CPU work. I have Melsec FX5U PLC controller and I have recently experimented with fixed scan program. I have created FC block and in case of execution function in Main Program (without interrupt), PLC cycle time was about 3 ms (max. cycle time - about 5ms).
The same function I have move from Main Program to Fixed Scan. In case of intterrupt 5 and 6ms the cycle time was as in the first case - about 3 ms (max. cycle time - about 5ms). In case of interrupt 4ms or less the cycle time was about 29ms and max. cycle time - 70ms.
It's quite consistent, but I have doubt if CPU will work properly in case of fixed scan program with interrupt cycle time lower than necessary time to execute the same program without interrupt.
Thank you in advance for answers!