What is purpose to use relay after digital output module? Why normally we don't use relay for digital input module?

3 Answers   Siemens, Sofcon,

---

i want piping routing interview questions ?

3 Answers   Lesus, ONGC, Penta Global, Technip,

---

Anyone answer what is average cost for 1 meter GI pipe Hot dipping

0 Answers   IPPL,

---

What is refrigeration cycle of HVAC .

0 Answers   DLF,

---

if zero ohm is not adjusted on shorting the two terminal of multimeter what does it indicate

0 Answers  

---

How three wire proximity can be used in place of two wire proximity?

0 Answers  

---

what is difference between a scada ,dcs & hmi?

2 Answers   MTS, Samtel,

---

Hoe electronic energy meter works?

0 Answers  

---

what is dc injection braking?

0 Answers   Samtel,

---

what is 3M

2 Answers   Samtel,

---

How capacitor bank can prove superior to synchronous condensers with respect to power factor correction?

0 Answers  

---

any body tell me why 4-20 ma use as a current any reason for this amount why not 3-25 ma?

1 Answers  

---