Do Siemens PLCs have dedicated thermistor modules? !
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Do Siemens PLCs have dedicated thermistor modules? ! What is the principle? ! Thank you! !
I think it’s just ordinary AI with an additional transmitter function
The most commonly used one is SM 331； AI 8 x 12 bits ； (6ES7331-7KF02-0AB0) is a general-purpose AI module that can measure current/voltage/thermal resistor/thermocouple signals. There are also dedicated thermistor measurement modules such as the SM 331 and AI 8 x RTD; (6ES7 331-7PF01-0AB0). The principle behind these devices is based on an unbalanced bridge circuit, and detailed documentation is available on Baidu Wenku.
What my brother said makes sense; it should be like that! !
8×12: Is one byte in a Siemens PLC CPU 12 bits? ? !
8×12: Is one word in a Siemens PLC CPU 12 bits? ? !
No, the address for Siemens AI is PIW; it involves analog-to-digital conversion through a module, that is, 4-20mA signals are converted into 12-bit digital values which are stored in a 16-bit word memory. 12 bits can be considered as the resolution; the higher the number of bits, the higher the resolution.
It’s a 12-bit digital value; in other words, 4 bits within 1 word are not utilized? !
There definitely are; to find out which model of module you need, check the selection manual.
It’s general-purpose, right? We use general-purpose modular AI for this on-site