What are the software requirements for a lathe??
i have got a PLC's assignment for my electronic and electrical engineering diploma at college, but i am stuck, the grill is about the software not the hard ware that as a sound out earlier on in the assignment. the query is referring to the inter locking guards and peddles and the signal output switches, please help me as i am in good health and truly stuck!!
"> so what's the question? Give details...
Edit:
Software and hardware are closely tied together. So if you write code for the PLC and include a safety interlock after you would have to have a piece of hardware call a safety interlock on the lathe.
How do you determine what software I/O you need to provide will depend upon your analysis of the equipment and how it operate. You would first look at the drawings and tech manual for the lathe and see what controls the manufacturer provides and what secondary types of equipment the manufacturer recommends which may or may not be included next to the lathe.
You come up with a basic electrics diagram and then do a HazOp analysis ( Hazardous Operation) where you evaluate disaster modes and their consiquences.
Interlocks are safety devices that prevent the machine from operating until enduring conditions are met. Such as a door switch that indicates an access door is closed. This prevents a person from sticking their hand surrounded by while the machine is running.
In a PLC you might impliment a "MASTER CONTROL" routine which doesn't allow the outputs contained in this group to operate unless a set of logic conditions are true. A series of N.O. contacts must be closed to indicate that adjectives door switched are true to then activate the MASTER CONTROL which next inturn allows the commands that operate the LATHE to function.
Basically anything that controls movement of a tool, acutator or motor must be interlocked so that an operator will not be injured if they bump a sensor or button. Only when adjectives safety conditions are met will the PLC code logic allow power to be sent via an output to activate "motion" or some type.
For input you hold to consider likely failure modes and potential override of a safekeeping by an operator.
For example consider a N.O. input connected to a N.O. SPST door switch. When the door is close the switch is closed causing the N.O. contact the PLC rung to close and label that rung true. A failure mode would be a wire break which would allow the door circuit to go amiss safe.
But now consider what happen if that wire shorts together. In this failure mode it doesn't go amiss safe.
One therefore call for to consider criticality or a likelyhood of injury on a type of interlock.
Certainly a door interlock need to failsafe in frequent different modes compared to an interlock that indicates material is in the chuck.
So to restore the door interlock in the above example you may use a SPDT switch which has N.O & N.C contacts feed N.O. & N.C. inputs on the PLC. Now if the wire shorts OR opens you hold a failure mode that can be detected by one switch type or the other as well as man more difficult for an operator to bypass by lifting a lead or using a pullover.
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"> so what's the question? Give details...
Edit:
Software and hardware are closely tied together. So if you write code for the PLC and include a safety interlock after you would have to have a piece of hardware call a safety interlock on the lathe.
How do you determine what software I/O you need to provide will depend upon your analysis of the equipment and how it operate. You would first look at the drawings and tech manual for the lathe and see what controls the manufacturer provides and what secondary types of equipment the manufacturer recommends which may or may not be included next to the lathe.
You come up with a basic electrics diagram and then do a HazOp analysis ( Hazardous Operation) where you evaluate disaster modes and their consiquences.
Interlocks are safety devices that prevent the machine from operating until enduring conditions are met. Such as a door switch that indicates an access door is closed. This prevents a person from sticking their hand surrounded by while the machine is running.
In a PLC you might impliment a "MASTER CONTROL" routine which doesn't allow the outputs contained in this group to operate unless a set of logic conditions are true. A series of N.O. contacts must be closed to indicate that adjectives door switched are true to then activate the MASTER CONTROL which next inturn allows the commands that operate the LATHE to function.
Basically anything that controls movement of a tool, acutator or motor must be interlocked so that an operator will not be injured if they bump a sensor or button. Only when adjectives safety conditions are met will the PLC code logic allow power to be sent via an output to activate "motion" or some type.
For input you hold to consider likely failure modes and potential override of a safekeeping by an operator.
For example consider a N.O. input connected to a N.O. SPST door switch. When the door is close the switch is closed causing the N.O. contact the PLC rung to close and label that rung true. A failure mode would be a wire break which would allow the door circuit to go amiss safe.
But now consider what happen if that wire shorts together. In this failure mode it doesn't go amiss safe.
One therefore call for to consider criticality or a likelyhood of injury on a type of interlock.
Certainly a door interlock need to failsafe in frequent different modes compared to an interlock that indicates material is in the chuck.
So to restore the door interlock in the above example you may use a SPDT switch which has N.O & N.C contacts feed N.O. & N.C. inputs on the PLC. Now if the wire shorts OR opens you hold a failure mode that can be detected by one switch type or the other as well as man more difficult for an operator to bypass by lifting a lead or using a pullover.
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