how to write program by ladder logic in case of PLC operation
- 3 Answers
- 16754 Views
- Gridco, Sofcon, I also Faced
- E-Mail Answers
Answer Posted / muhammad uzair
Ladder Logic is simply an interpretation of OR, AND, NOR,
XOR, XNOR, NAND functions. First you solve the problem
using the above functions & then transform the symbols into
those of ladder logic.
Each rung of ladder language typically has one coil at the
far right. Some manufacturers may allow more than one
output coil on a rung.
--( )-- a regular coil, true when its rung is true
--(\)-- a "not" coil, false when its rung is true
--[ ]-- A regular contact, true when its coil is true
(normally false)
--[\]-- A "not" contact, false when its coil is true
(normally true)
The "coil" (output of a rung) may represent a physical
output which operates some device connected to the
programmable controller, or may represent an internal
storage bit for use elsewhere in the program.
Example:
S = X AND ( Y OR Z )
----[ ]---------|--[ ]--|------( )--
X | Y | S
| |
|--[ ]--|
Z
| Is This Answer Correct ? | 72 Yes | 14 No |
Post New Answer View All Answers
What is negative sequence over voltage element?
reason of diode failure in alternator
Single phase and threephase power calculation
HOW DO YOU CAN CHECK A 15KV DIODE, WHETHER IT IS OK OR NOT?
A 3-phase IM is supplied from 50 Hz system. It runs at speed of 1440 rpm and slip equal to 4 %. Calculate number of pole pairs. A 1 B 6 C 2 D 3
Where servomechanism is used?
ACB & VCB how do work and saftes and how can maintenance in this and parts name show with picture
how to compute kAIC? with formulas...
Explain the working of variable frequency transformer?
What effect does a very low impedance have on the Voltage regulation? On the short-circuit current?
Is it required to lay GI wires along with GI/MS conduits from one point to another point though separate earthing cable is conncted from DB to Socket?
What should be the Sandwitch type Al. bus bar capacity for 2 M.W.Gen. set, having continuous full load current- 3463 Amps,ambient temp.- 50 Deg. C., Required temp. raise-20 deg.C., it will run 24 hrs, 365 days on full load, required highly reliable.
upto how much low RPM we will run the commercial motor which is run through VFD without any problem occurs in motor.Motor rating Duty is S1 & RPM is 1400.
why incomer bay is required before transformer bay if there are more than 1 nos. of transformer bay.
Dear Sir/Madam, I have one questions we have three steam turbines and one Gas turbine and our industry linked with the public network, we have protection system one of the protection is reverse power we can export just four MW only i would like to ask about how to calculate the reverse power. Thank you in advance best regards
