michael_mayer
Member
Hello !
Can someone explain the difference of high vs Low input level in analog input modules?
Thanks in advance
Can someone explain the difference of high vs Low input level in analog input modules?
Thanks in advance
High vs Low Input Level
- Thread starter michael_mayer
- Start date
danw
Lifetime Supporting Member
There's no rules as far as I know, it's marketing, company by company.
I can tell you that Honeywell calls 4-20mA, 0/1-5Vdc, 0/2-10Vdc "high level" analog inputs for its PAC/PLC, recorder and PID controller consider.
Thermocouple, mV, RTD and resistance (slidewire feedback) are part of their universal inputs that also include the high level analog signals.
Someone like Yokogawa who has AC modules for some of their stuff might use the term 'high level' differently.
I can tell you that Honeywell calls 4-20mA, 0/1-5Vdc, 0/2-10Vdc "high level" analog inputs for its PAC/PLC, recorder and PID controller consider.
Thermocouple, mV, RTD and resistance (slidewire feedback) are part of their universal inputs that also include the high level analog signals.
Someone like Yokogawa who has AC modules for some of their stuff might use the term 'high level' differently.
michael_mayer
Member
OP
Can you refer to a drawing so I can understand the concept better? I find it difficult to grasp the common ground concept and its disadvantages...
Thank you for your reply
Last edited:
michael_mayer
Member
OP
What is slidewire feedback ?
Also when you refer to resistance measurement(Thermocouple, mV, RTD and resistance) , is it the resistance you measure or the voltage drop across it?
danw
Lifetime Supporting Member
An electric actuator can report its position with a variable resistor commonly called a slidewire because there's a wiper that slides along a strip or winding of resistance material.
Typically, the controller generates a fixed current, drives the current through the external resistance, and then measures the voltage drop across the external resistance.
danw
Lifetime Supporting Member
A decent, basic explanation here:
https://ueidaq.wordpress.com/2013/11/18/how-to-use-differential-inputs-to-enhance-noise-immunity/
Last edited:
michael_mayer
Member
OP
Thank you very much really appreciate it.please give the time to study these in more detail and come back for further assistance if needed!
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