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What are interlocks in PLC?
1 thought on “Concept of Interlocking in PLC” An interlock is a feature that makes the state of two mechanisms or functions mutually dependent. It may be used to prevent undesired states in a finite-state machine, and may consist of any electrical, electronic, or mechanical devices or systems.
What is the purpose of Interlocking?
“Interlocking” and “guard locking” According to this definition, an “interlocking device” or “interlock” is a “mechanical, electrical or other type of device, the purpose of which is to prevent the operation of hazardous machine functions under specified conditions” (generally as long as the guard has not closed).
What is an example of Interlocking?
Interlock Examples Examples of consumer products incorporating interlocks are: Removal of a guard on a food processor prevents the operation of the motor and blade, thereby reducing the opportunity for spinning blade injury (example of guard).
What is interlock in DCS?
An Interlock is in essence a ‘self resetting’ Trip. Interlocks are normally initiated by the DCS or PLCs, however if an Interlock is deemed to be safety related it may, depending upon SIL rating, be implemented in the SIS or a Hardwired system.
What are the types of interlocking?
Interlocking types
- Mechanical interlocking.
- Electro-mechanical interlocking.
- Relay interlocking.
- Electronic interlocking.
What is interlocking circuit?
To interconnect the motor circuit in such a way, in which the second motor will not start until the first one run likewise the third one motor will not run unless the second one run and so on. This kind of motor circuit connection is called interlocking.
What is pump interlock?
To avoid a dead-head of the pump as a result of closed suction and discharge valves, you can deploy valve interlocks to enforce a predefined valve operation sequence. The valve operation sequence guarantees that the suction and discharge valves are opened first, before the power switch of the pump can be turned on.
What is trips and interlocks?
An Interlock is in essence a ‘self resetting’ Trip. Once a device or devices have been forced to a pre-determined state by the action of an Interlock they will remain in that state until the initiating cause returns to a ‘healthy’ condition, the Interlock will then be automatically removed.
What is an electrical interlock?
An electrical interlock is an interlock that is used to restrict current flow between two or more devices. These types of interlocks use normally open and normally closed contacts to prevent another device from turning on. Relays and contactors are typically used as electrical interlocks.
How to work with people on the interlock list?
When you are working with someone on the interlock list, make sure you both understand which way you are talking. Kindly Consider NC contacts instead of NO Contacts for STOP and E- STOP. Logic or programming in PLC is done using Ladder logic or other formats.
What is an example of a logical interlock?
The start button being pressed for three seconds is the interlock for the start sequence. Another example of a logical interlock is a pneumatic cylinder. Sometimes you need to prevent movement from two cylinders that could physically collide. Cylinder A moves horizontally.
What is interinterlocking in general?
Interlocking in general is called protocol action. It means defined bunch action to be taken when certain conditions occur.