Analog Input Resolution

sumit_b

Is there any LOGO! hardware option that allows for greater than 10-bit analog input resolution?   I would like to read the value in to my LOGO! 8 12/24 RCE.

If you allow other hardware options than Siemens Logo, then you can use a remote Modbus TCP/IP device, but you at least need a Logo 8.1 (FS4) or a brandnew Logo 8.2 for Modbus.

Higher resolution causes a higher price, that's normal and you must think about the Logo arithmetic only calculates with integer values. Search for Adam-6717 on Advantech for example.

Maybe you get lower price Modbus remote devices from China, but be careful, you need Modbus TCP/IP, not Modbus RTU. Lower prices often causes instability in 24/7 mode.

For a little more money you can get a S7-1200 controller with high resolution analog inputs and a greater program memory.

Regards, Scorp

Scorp

Maybe you get lower price Modbus remote devices from China, but be careful, you need Modbus TCP/IP, not Modbus RTU. Lower prices often causes instability in 24/7 mode.

For a little more money you can get a S7-1200 controller with high resolution analog inputs and a greater program memory.

Thank you.  Yes, I found cheap Modbus TCP/IP devices, but long term reliability would be a concern.   I am looking into S7-1200 with 13-bit analog inputs module,  but that may be too expensive for my personal home automation project.

I don't know your budget. If you already have the Logo base module, it would be cheaper to add a remote Modbus device instead of buying a new controller with in/out modules. Advantech also offer a WISE-4010/LAN with 4 analog inputs for a lower price, i have got it for ~100 EUR and i have it connected to a Logo controller. This works fine, but i don' have any long term experience.

Regards, Scorp