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The maximum hm2 encoder count rate depends on the sample frequency
At the maximum 7I90HD encoder sample frequency of 100 MHz, the built in 3 clock (filter off)
input digital filter means that a quadrature  input signal must last at least 30 ns to be detected.
This means an approximate maximum count rate of ~60 MHz. Practical
real world signal integrity  considerations limit maximum count rates to about 10 MHz.

Dear elovalvo
Did you install successfully igh ethercat for Rasp 5?
I tried to install, but I got the error.
This error is " modprobe: FATAL: Module ec_master not found in directory /lib/modules/6.6.21-rpi999-rpi-2712"

The 7i90HD manual mentions a medium speed real time interface (around 1 Mbyte/sec) in EPP. However, I'm specifically interested in the maximum encoder count rate. Could someone please provide this information?.

Thank you.
 

Hi people, I'm Hernan and I'm just starting in the world of EtherCAT and my knowledge about the protocol is very limited, my main intention is to establish communication between the AX58100 with a STM32 (H753ZI) to make an encoder and the documentation I've found is very scarce, does anyone know how I can do this or know where I can find documentation to do it? I have been reviewing Chinese forums such as CSDN about this topic but I can not establish communication between these chips and I really do not know what to do, I know that here there are people who have a lot of knowledge and can give me a hint where to start, I remain at your disposal and thank you in advance.

btvpimill wrote:

If I understand this correctly, it is trying to read the data starting at address 0305h?
If thats true, I think that address does not exist in my controller.
 

No, the layout is:

[01] Modbus address
[01] Read Function
[03] Three byte command
[05] Read parameter 5 ( PD005 Max Operating Frequency )
[00, 00] placeholder data, unused
[2C, 4F] Checksum.

Your error response is:

[01] Modbis address
[81] Error bit (80) + the command [01] = 0x81
[02] = Illegal Data Address*
[C1, 91] Checksum

I don't know why it is saying "illegal address" as this has been working for several years on my own lathe with HyVFD and the driver code hasn't changed very much in that time. 

_My_ VFD isn't even sending a valid response, or a correct checksum. 

Function code 40 is wrong, 0xA0 is _way_ too many bytes, d0 isn't an exception code, and 36EE is not a valid checksum. 

Unfortunately I can't even see my VFD control panel without pulling the lathe away from the wall. I really hope I don't need to do that. Though it would be a good opportunity to fit a braking resistor. 






*The data address received in the query is not an allowable address for the slave. More specifically, the combination of reference number and transfer length is invalid. For a controller with 100 registers, a request with offset 96 and length 4 would succeed, a request with offset 96 and length 5 will generate exception 02.