Circuits monitoring device

Devices for monitoring safety-related circuits are also referred to as emergency stop switching devices or safety relays. But what is the difference to a normal switching relay? You will find out in the following sections. Rely on quality and equip your safety-related circuits with high-quality emergency switching devices from the eibabo® online shop.

Source: eibabo®, Pilz PNOZ XV2 emergency stop switchImage: Pilz PNOZ XV2 emergency stop switching device

What are safety relays?

Despite automation, people are always involved in the implementation of technological processes. Safety at work plays a central role in this. By selecting suitable protective measures, the risk of endangering the health or life of people in the working area of a machine can be reduced. The most important protective elements include safety relays. Their task is to switch off the power supply in the event of a fault, danger or defect. This protects the life or health of the operator and prevents damage to the machine, the facility or the system.

Originally, safety circuits were equipped with a single electromechanical contactor and combined with a circuit-connected safety switch. However, this variant did not offer complete protection. If, for example, the contacts of the contactor stuck together, the machine or system continued to run despite the safety switch being actuated. The solution to this problem was to add an additional contactor to the circuit. This already reduced the probability of errors, but still did not provide complete protection. Electronic devices were therefore developed which were equipped with at least two relays and a microprocessor system. A safety relay is therefore protected several times and automatically checks with each switching cycle whether its own safety device is still working properly. Even if a component fails, the safety device remains effective. The function of these safety relays henceforth made it possible to eliminate the risks associated with the use of a single contactor while knowing the status of input devices and output devices.

Where are circuit monitoring devices used?

The classic place of use for circuit monitoring devices is industrial systems. These devices are used wherever a workplace is potentially dangerous due to moving parts of a machine. The following safety circuits are the most common:

The emergency stop switch

The emergency stop button is a large, robust and strikingly designed button that you can use to manually activate the safety relay and bring a machine to a standstill in the event of a hazard.

Tip for saving:

Complementary to circuit monitors are emergency stop switches and other components to create a complete safety device. Benefit from our low prices and save costs with combined shipping.


Two-hand operation

As the name suggests, a circuit in this circuit is only closed when you press two different buttons with both hands. This is to prevent you from accidentally reaching into a rotating machine, for example. As soon as you release one of the two buttons, the safety relay stops the machine.

protective doors

Dangerous working areas are often provided with protective doors. Opening such a protective door triggers the safety relay, which then immediately interrupts the circuit. The machine stops.

Light grids / light barriers

Where no protective doors or other physical barriers can prevent access to dangerous areas, the safety regulations are implemented using light grids or light barriers. If an object enters the monitored danger area, the safety relay is triggered and the machine stops.

How is a safety relay structured?

The typical structure of the safety relay uses a classic combination of 3 contactors. This system redundancy provides increased device reliability. Two relays ensure safe contact switching. Each is driven by one of the two input circuits. The operation of these circuits is not only determined by the signal present at their outputs, but is started by the starting relay. Between its outputs there is a control circuit (also a monitoring circuit) which checks the position of the actuators to be controlled and switched. What does that mean? After switching on, the device carries out a self-test. The input devices are checked first. If their circuits are closed, a safe state has been reached. The output devices are then checked. Here, too, the safety relay waits for a start signal, upon receipt of which the output devices are activated. The safety functions of the relay are now also activated and the device is ready to fulfill the required safety tasks.

What are the advantages of programmable safety relays?

There are applications where a conventional safety relay would not suffice. In such cases, using a programmable safety relay can be an excellent alternative. This is especially true in more complex systems where using a traditional relay would be cumbersome or impossible. Programmable safety relays are also referred to as control devices for circuit monitoring or programmable logic controllers (PLC).

 


In a nutshell:

Programmable logic controllers are devices that allow you to implement more safety functions than individual relays.


 

While a separate safety relay is used for each device by default, one PLC can secure multiple devices. This saves a lot of space in the control cabinet. You can also use it to control processes that can be changed or corrected at any time. The programmable safety relays consist of input modules and output modules as well as a central unit. A processor executes the control algorithm stored in memory based on the data read from the input modules. The control signals are then sent to the output modules. These forward the signals to the corresponding actuators, which are connected to the relay outputs. Programming is done using a computer and the appropriate software or via the built-in keyboard or display. PLCs are most commonly found in modern security systems where sophisticated communication and complex data exchange takes place.

Based on your requirements, you can now assess whether an emergency stop relay or a PLC is right for your application. Here you can get high-quality products from well-known brands such as Pilz, Siemens, Weidmüller, Wieland, Dold, Rockwell, ABB and many others.

 

eibabo - technology store

 

Catalogue content:


In this eibabo® catalogue Relays > Device for monitoring of safety-related circuits you will find items from the following product groups:

Item overview:

  • Compact power supply
  • Contact extension
  • DC power supply
  • Emergency stop relay
  • Encoder module
  • Isolation guard
  • Light barrier guard
  • Light curtain
  • Muting function
  • Off-delayed
  • Output expansion device
  • Press safety
  • Press safety valve
  • Press valve
  • Protective door monitoring
  • Protective door monitoring device
  • Protective door relay
  • Protective gate guard
  • Relay module
  • Safety control
  • Safety relay
  • Safety switching device
  • Safety switching relay
  • Security module
  • Security technology
  • Transfer point
  • Valve monitoring device
  • Valve monitoring module


from the following manufacturers:

Manufacturer overview catalogue Circuits monitoring device:

  • ABB
  • Dold
  • Eaton
  • Elotech
  • Euchner
  • Ifm Electronic
  • Leuze
  • Pepperl + Fuchs
  • Peter
  • Phoenix
  • Pilz
  • Rockwell
  • Schmersal
  • Schneider Electric
  • Sick
  • Siemens
  • Stahl
  • Weidmüller
  • Wieland


 
Devices for monitoring safety-related circuits are also referred to as emergency stop switching devices or safety relays. But what is the difference to a normal switching relay? You will find out... read more »
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Circuit monitoring device - safety in the event of sudden danger

Devices for monitoring safety-related circuits are also referred to as emergency stop switching devices or safety relays. But what is the difference to a normal switching relay? You will find out in the following sections. Rely on quality and equip your safety-related circuits with high-quality emergency switching devices from the eibabo® online shop.

Source: eibabo®, Pilz PNOZ XV2 emergency stop switchImage: Pilz PNOZ XV2 emergency stop switching device

What are safety relays?

Despite automation, people are always involved in the implementation of technological processes. Safety at work plays a central role in this. By selecting suitable protective measures, the risk of endangering the health or life of people in the working area of a machine can be reduced. The most important protective elements include safety relays. Their task is to switch off the power supply in the event of a fault, danger or defect. This protects the life or health of the operator and prevents damage to the machine, the facility or the system.

Originally, safety circuits were equipped with a single electromechanical contactor and combined with a circuit-connected safety switch. However, this variant did not offer complete protection. If, for example, the contacts of the contactor stuck together, the machine or system continued to run despite the safety switch being actuated. The solution to this problem was to add an additional contactor to the circuit. This already reduced the probability of errors, but still did not provide complete protection. Electronic devices were therefore developed which were equipped with at least two relays and a microprocessor system. A safety relay is therefore protected several times and automatically checks with each switching cycle whether its own safety device is still working properly. Even if a component fails, the safety device remains effective. The function of these safety relays henceforth made it possible to eliminate the risks associated with the use of a single contactor while knowing the status of input devices and output devices.

Where are circuit monitoring devices used?

The classic place of use for circuit monitoring devices is industrial systems. These devices are used wherever a workplace is potentially dangerous due to moving parts of a machine. The following safety circuits are the most common:

The emergency stop switch

The emergency stop button is a large, robust and strikingly designed button that you can use to manually activate the safety relay and bring a machine to a standstill in the event of a hazard.

Tip for saving:

Complementary to circuit monitors are emergency stop switches and other components to create a complete safety device. Benefit from our low prices and save costs with combined shipping.


Two-hand operation

As the name suggests, a circuit in this circuit is only closed when you press two different buttons with both hands. This is to prevent you from accidentally reaching into a rotating machine, for example. As soon as you release one of the two buttons, the safety relay stops the machine.

protective doors

Dangerous working areas are often provided with protective doors. Opening such a protective door triggers the safety relay, which then immediately interrupts the circuit. The machine stops.

Light grids / light barriers

Where no protective doors or other physical barriers can prevent access to dangerous areas, the safety regulations are implemented using light grids or light barriers. If an object enters the monitored danger area, the safety relay is triggered and the machine stops.

How is a safety relay structured?

The typical structure of the safety relay uses a classic combination of 3 contactors. This system redundancy provides increased device reliability. Two relays ensure safe contact switching. Each is driven by one of the two input circuits. The operation of these circuits is not only determined by the signal present at their outputs, but is started by the starting relay. Between its outputs there is a control circuit (also a monitoring circuit) which checks the position of the actuators to be controlled and switched. What does that mean? After switching on, the device carries out a self-test. The input devices are checked first. If their circuits are closed, a safe state has been reached. The output devices are then checked. Here, too, the safety relay waits for a start signal, upon receipt of which the output devices are activated. The safety functions of the relay are now also activated and the device is ready to fulfill the required safety tasks.

What are the advantages of programmable safety relays?

There are applications where a conventional safety relay would not suffice. In such cases, using a programmable safety relay can be an excellent alternative. This is especially true in more complex systems where using a traditional relay would be cumbersome or impossible. Programmable safety relays are also referred to as control devices for circuit monitoring or programmable logic controllers (PLC).

 


In a nutshell:

Programmable logic controllers are devices that allow you to implement more safety functions than individual relays.


 

While a separate safety relay is used for each device by default, one PLC can secure multiple devices. This saves a lot of space in the control cabinet. You can also use it to control processes that can be changed or corrected at any time. The programmable safety relays consist of input modules and output modules as well as a central unit. A processor executes the control algorithm stored in memory based on the data read from the input modules. The control signals are then sent to the output modules. These forward the signals to the corresponding actuators, which are connected to the relay outputs. Programming is done using a computer and the appropriate software or via the built-in keyboard or display. PLCs are most commonly found in modern security systems where sophisticated communication and complex data exchange takes place.

Based on your requirements, you can now assess whether an emergency stop relay or a PLC is right for your application. Here you can get high-quality products from well-known brands such as Pilz, Siemens, Weidmüller, Wieland, Dold, Rockwell, ABB and many others.

 

eibabo - technology store

 

Catalogue content:


In this eibabo® catalogue Relays > Device for monitoring of safety-related circuits you will find items from the following product groups:

Item overview:

  • Compact power supply
  • Contact extension
  • DC power supply
  • Emergency stop relay
  • Encoder module
  • Isolation guard
  • Light barrier guard
  • Light curtain
  • Muting function
  • Off-delayed
  • Output expansion device
  • Press safety
  • Press safety valve
  • Press valve
  • Protective door monitoring
  • Protective door monitoring device
  • Protective door relay
  • Protective gate guard
  • Relay module
  • Safety control
  • Safety relay
  • Safety switching device
  • Safety switching relay
  • Security module
  • Security technology
  • Transfer point
  • Valve monitoring device
  • Valve monitoring module


from the following manufacturers:

Manufacturer overview catalogue Circuits monitoring device:

  • ABB
  • Dold
  • Eaton
  • Elotech
  • Euchner
  • Ifm Electronic
  • Leuze
  • Pepperl + Fuchs
  • Peter
  • Phoenix
  • Pilz
  • Rockwell
  • Schmersal
  • Schneider Electric
  • Sick
  • Siemens
  • Stahl
  • Weidmüller
  • Wieland
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