Hi,
How to preserve NVRAM writing cycles when SDO settings are needed at startup?
Context:
I have an encoder interface (Beckhoff EL5021), and I have to change the setting
for the parameter "Analog Resolution" @ 0x8001:11
This parameter is stored in a NVRAM, that supports about 100,000 writing cycles
(according to Beckhoff Support Engineers)
There are at least two ways to setup this parameter:
1- using command "ethercat upload/download"
pros: it preserves NVRAM writing cycles because I can check the value before
changing it.
cons: it must be repeated again when replacing modules
2- using ecrt_slave_config_sdoXX to define a list of SDO command to apply on
startup
pros: nothing special to do when replacing modules
cons: it wastes NVRAM writing cycles, when applied on an already configured
module (for example, when program restarts)
For the moment I am thinking about running a dedicated script based on ethercat
upload/download (method #1) before starting the ethercat control program, but it
is very inelegant, so I wonder if someone have a better idea.
Note: in TwinCAT, Beckhoff uses a smart start-up list: the new values are
written only if needed.
best regards
--
Sebastien BLANCHET
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