2wire connection to a 4wire modul ?? (Siemens)

In a project I've choosen for the next modul:

6ES7134-4GB11-0AB0
SIMATIC DP, ELECTRONIC MODULE FOR ET 200S, 2 AI STAND. I-4DMU 15 MM WIDE, +/-20MA; 13 BIT + SIGN,4 .. 20MA; 12 BIT FOR 4-WIRE TRANSDUCER CYCLE TIME 65 MS/CHANNEL WITH LED SF (GROUP FAULT)

It's especially for 4wire connection.
Now I see that I have a 2wire pressure sensor (to measure a volume in a tank). It works from 4 to 20mA, 0 to 6 bar.

I connected the 2wire sensor on the 4wire modul like this:

24V to 1 of the sensor
2 of the sensor to the Analogue input of the modul (M+).
0V to the analogue input (M-)


Can this work, 2wire connection on 4wire module ?
Or do we need to exchange to a module that is 2wire ?

Kind Regards,
Gerry

Yes it works with external 24V in the loop. But if you get a short circuit on the sensor cable, your AI might blow up.

Kalle

hmm

I think I will have to take that risk then. I first ordered a High Feature Card, but it could not be delivered in time, so I ordered a 4wire 6AG7 instead of 6ES7, because 6ES7 was also not in their mall.

I didn't have the information of the sensor in advance, that was the annoying thing.

KalleOlsen said:

Yes it works with external 24V in the loop. But if you get a short circuit on the sensor cable, your AI might blow up.

Kalle

Click to expand...

Looking at the diagram for the module, the 24V output is current limited to 30mA so a short on the cable shouldn't be a problem.

http://support.automation.siemens.c...ib.csFetch&nodeid=26546804&forcedownload=true

great

indeed

Voltages, currents, potentials
Rated load voltage L+ (from the power module) 24 VDC​

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Power dissipation of the module Typically 0.6 W

thanks

BryanG said:

Looking at the diagram for the module, the 24V output is current limited to 30mA so a short on the cable shouldn't be a problem.

http://support.automation.siemens.c...ib.csFetch&nodeid=26546804&forcedownload=true

Click to expand...