Answer / carl_ellis

1) A light dimmer switch

2) the throttle on an automobile

If you SOURCE your outputs from a PLC, would you have to make the output HIGH, or LOW, in order to switch an output ON?

1 Answers  

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What is the difference between Analytical instruments and other instruments?

7 Answers   Schenck,

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What is the use of the shield wire and how is the connection at both the ends of a shield wire?

2 Answers   Samsung,

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how to relay switch sense the fault?

0 Answers   ME,

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What is the principle of a Pressure gauge?

2 Answers   CCIE,

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What standards are used for earthing of field instruments?

1 Answers  

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what is the essential difference between DIODE and SCR in term of application.

2 Answers   ADMA OPCO,

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In RTU Panel we are having several Analogue & Digital Inputs /Outputs. We are recently facing some problems over Analog inputs , which are not updating properly (But Digital Input are updating normally) Can any one tell me from where the problem is creating , we have checked PLC CPU card, Analog Input card & we reconfigured ,But still the issue is there. Issue : 1. Sometimes Analog values are updating & sometimes not. 2. Analog values are not updating normally , showing some wrong Values 3. Total dead (0 value) Analog values are Level & flow measurement from the field instruments. (But in field the instruments are working normally & Displaying the values normally in local display unit) This problem we are facing in our Water Plant. If any one experienced this same problem or having any ideas related to our issue PLS send your valuable Answers/Replies...

6 Answers   L&T,

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what is the diffrence between LCN and UCN

2 Answers  

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Someone please do mail me some instrumentation questions for Hindustan Petroleum test to avinalexander@gmail.com .Really would be gateful if someone could help me

3 Answers   HPCL, Immersion, IOCL,

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how to wire from pressure transmitter to marshalling panel and panel to controller and controller to dcs plz give the answer with example .

2 Answers  

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What are three main programming in PLC

5 Answers  

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