conectar en serie 2 entradas analógicas de 2 plc

Buenos días.

Nesecito conectar una señal analógica 4-20mA a 2 entradas analógicas una de un módulo de un s7 1500 y la otra de una ET200. ¿Alguien me podría decir si es posible esto o no y si es posible como lo debería hacer?

Espero que alguien me pueda ayudar.

Un saludo

 Hola David;

Este foro de Siemens ayuda a gente de muchos paises, y la mayoria aqui no habla espanol. Por eso hemos escojido ingles como lengua de intercambio. De este modo muchhos mas pueden participar

Haznos el favor de usar ingles la proxima vez que nos visita.

Hello David.

On the Siemens forum we help many members from many countries, Most of us do not speak Spanish. We have chosen English as an exchange language. This way  many more participate.

Please do us the favour of using English on your next visit.

Hope this helps,

Daniel Chartier

Translation from the Spanish text::         David_Paviso

Good morning;

I need to connect a 4-20 mA analog signal to 2 analog inputs, one on a S7-1500 module and another on a ET 200. Can someone tell me if it is possible, and if it is not how should I do it?

I hope someone can help me.

Thank you.

Hello David;

Connecting a 4-20 mA signal to 2 different input modules can be done, but it requires much attention to details.

- the original signal must be passive (2-wire), so the loop does not exceed its max. voltage limit.

- the whole 4-20 mA loop must be floating (no grounding), which might interfere with the functionning of the PLC installations.

- If any one of the elements in tthe loop fails or is left unpowered the whole loop will fail; no signal will be transmitted.

It would be better to think in terms of a loop splitter that will connect to the instrument producing the orignial 4-20 mA signal and produce 2 (or more) identical analog values that would be connected to the different analog input modules in the loop.These signals are generally conditionned and isolated, so removing one of the PLCs will not affect the other.

See for example this discussion on the forum, and various sources for loop splitters:

https://support.industry.siemens.com/tf/fr/en/posts/splitter-and-digital-indicator/141793/?page=0&pageSize=10

https://www.acromag.com/catalog/198/4-20ma-isolators-splitters/4-20ma-splitters

https://www.phoenixcontact.com/online/portal/us?uri=pxc-oc-itemdetail:pid=2864794

https://www.laurels.com/qls.php

Hope this helps,

Daniel Chartier