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A "Programmable Logic Controller" can have a switch to either tell the machine when it has reached a certain position at or near the limit of its travel, or a switch that over-rides the maximum or minimum programmed limits for safety. The mechanics can be electrical, laser, pneumatic, or any type that is reliable for the device.
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What does a plc does?
Programming Logic Controller is a controller, which gets input from sensors,read/limit switch and controls the output according to the Ladder logic program.
How does a plc work?
as flip flop
How does plc controller work?
simply as a relay.
How does a plc counter work?
as flip flop
What is electrical panel and PLC panel?
Electrical panel consist of hardwired circuits, a plc is a panel that uses logic like a computer and it's progrmamable to have a circuit switch on or off
Does David Smith work in Barclays plc London?
no
How a direct online starter programmed in plc?
DOL starter is a direct online starter... so its PLC programme is as follows: Use a series connecion of 1 NO and 1 NC switch and a motor.. And make a parallel connection of d NO switch with another NO switch.. Addressing: 1 2 3 ------------|\|----------(output) | | | 3 | |----|
Does Sarah Smith work in barclays bank of London plc?
working as head international transfer dept barclays bank plc
What is the Limit switches working principle?
Limit switch is one type Of " Contact Sensor" , In that there is Normally Open Contact & Normally Close Contact, In limit switch there is Plunger it is Directly Connected to NO & NC Contact if we press the plunger NO contact become NC & NC contact become NO, Working Principle same as Contactor ( DOL starter ) main difference is in contactor There is Coil to attract the Plunger But In Limit Swict Plunger is Operated Mecanically.Limit Switches is used mainly for Safety Purpose & to take Feed back for PLC in Automation industries........Source(s):In My Plant I have installed limit Switches.. A limit switch is a switch, usually mechanical, that is actuated by a moving part of some machine. Its operation is much like any other switch in that there are contacts that move when a plunger or lever on the outside of the switch is pushed. Internally there is an over center spring mechanism that snaps the switch open or shut in response to a gradual motion of the plunger or lever.Many limit switches have three terminals. One is the normally closed contact, another the normally open contact, and the third is the common that switches between these two as the mechanism is moved.
What is a disadvantage of a PLC?
a disadvangte of a plc is that if you you run a public limited company that means you have to serve complte strangers so you have to work extar hard to impress them.
How do you Program an Allen Bradley PLC?
By using a programming terminal / pc/laptop with development software. For a control logix family of AB make PLC, install RSlogix5000 software on a laptop and connect to plc on its suitable port, say Ethernet.
How do you drive a motor requiring 2.6 ampere current using a micro controller whose output is 5 V and current in milliamperes?
A PLC uses intermediary relays between the PLC and the load. The relays have the proper load requirements that the PLC's output can handle. PLC drives the relay, relay drives the motor.
