Load Resistors on a Micrologix 1100 & 1746-IF4?

wlr3m4

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• Feb 27, 2018

• #1

I cannot find anything anything in the manual for a load resistor, does this PLC not have any built in? Is it a dipswitch setting?

 

jstolaruk

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• Feb 27, 2018

• #2

No. The IF4 has an input impedance of 220K ohms on the voltage terminals, 250 ohms on the current terminals.

 

Mickey

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• Feb 27, 2018

• #3

Load Resistors on a Micrologix 1100 & 1746-IF4?

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ML1100 expansion module or embedded analog input?

If expansion module, is it a 1762-IF4? If so see specs below

voltage 200K ohms
current 275 ohms

Embedded analog on a ML1100 is voltage only at 210K ohms

There is a dip switch on the 1762-IF4 to select the type of input current/voltage.

 

Last edited: Feb 27, 2018

wlr3m4

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• Feb 28, 2018

• #4

It is indeed a 1762-IF4

 

Pete.S.

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• Feb 28, 2018

• #5

That why 0-10V voltage instead of 4-20mA current is bad for an analog signal.

Always go for 4-20mA.