Safety PLC - Safety controller

Safety controller and Safety PLC

A safety controller or safety PLC has an important role within a safety system. Potential hazards of machines or installations must be managed safely. Safety switches monitor the status of safety devices. When an unsafe situation is detected, the safety relay will give a signal that switches off the energy to the potentially dangerous machine or safely interrupts the safety circuit.

Multiple safety switches

A safety PLC can manage one or more safety switches, such as safety light curtains, photocells, emergency stops, laser scanners, electromechanical switches, magnetic switches, lock safety door switches, RFID switches, safety mats and so on. A safety relay has two functions; on the one hand the processing of the signals from the connected safety switches and components and on the other hand the safe and reliable interruption or disconnection of potentially dangerous machine (functions).

Functions safety PLC

In addition to 'standard' safety relays, there are also wireless and safety PLC's. In applications where there is little or no room for cables, a wireless safety relay can offer the solution. If it is desirable for only a part of the connected safety switches to switch off or fall into emergency stop when an unsafe situation is detected, a safety PLC provides the solution.


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Safety controller - Safety PLC - ReeR Safety
Safety controller - Safety PLC Mosiac - ReeR Safety

Safety PLC to set up a safety system

Safety system with safety PLC

In the detection of an unsafe situation, it may be desirable that not all connected safety switches switch to an emergency stop or switch off. A flexible safety PLC offers the solution here. The Mosaic from ReeR Safety is a safety PLC for securing machines and/or installations and makes configuration of safety circuits easy for every application. View the application example with application of the Mosaic safety PLC.

Main module safety PLC

The safety PLC from ReeR consists of one main module and can be extended with seven other modules that are connected via the bus at the rear. The main module M1 can act as a standalone relay for the protection and monitoring of smaller machines, for example 1 safety light curtain, 1 emergency stop, 1 magnetic sensor and 1 two-handed switch or as main module to protect complex safety systems of larger machines.

Components safety system

The safety PLC is suitable for monitoring various safety sensors such as safety light curtains, laser scanners, photocells, mechanical and magnetic (end) switches, mats, emergency stop and emergency stop buttons, encoders, RFID switches, handle switches and two-hand operation in one flexible system. You are not affiliated with ReeR when compiling your safety system and when using ReeR Mosaic. Other safety components can also be connected to ReeR Mosaic. View switches for machine safety.


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Analog input module MA4 - ReeR Safety

Analog input module - Safety PLC

Safely register and process pressure, temperature, filling level and distance? Inputs of measuring transducers or sensors can be connected to the safe analogue input module MA4 from ReeR Safety.

Safe up to PL e or SIL CL 3

With this module, processes up to PL e (according to ISO 13849-1) or SIL CL 3 (according to IEC 61508 - IEC 62061) can be registered and monitored safely. Read more about analog input module MA4.

Features analog input module MA4:

  • Temperature: -10 ° C to + 55 ° C
  • Protection class: IP20
  • With MSC connector
  • Dimensions: 108 x 22.5 x 114.5 mm


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Safety PLC MCM memory card - Mosaic - ReeR Safety

Benefits safety PLC

Less components

Compared to traditional safety relays, the safety PLC from ReeR offers a number of notable advantages. The Mosaic reduces the number of components in the electronic cabinet. All logic is configured by a graphical interface. This ensures less wiring and a lower footprint and promotes the fast construction of the electrical cabinet.

Higher safety level

A lower number of electromechanical components also ensures a higher safety level. With the safety PLC from ReeR a Performance Level e / Category 4 is possible. Thanks to the simple programming software, the necessary configuration is supported, machine builders can always change the configuration logic. Safety components can be added or removed at any stage during the design of the machine or technical installation, using the user-friendly software. The main module M1 is configurable via the MSD (Mosaic Safety Designer) graphical interface, which is supplied with each main module.

MCM memory card

The MCM memory card can be used to transfer the configuration program in a few easy steps to a new Mosaic safety PLC's. The Mosaic makes it possible to set up fraud-proof security systems.

Simulation function

During the design phase it is possible to check the logical configuration using the validation function. Thanks to the simulation function, the safety system can be tested and simulated during installation via the monitor. The Mosaic allows manipulation-resistant system configurations, for example detecting attempts to circumvent the safety components. During the start-up of the machine, a mandatory test is required to check the safety device. The entire project is protected against unauthorized changes with 2-level password. The project shows the actual values ​​PFHd, DCavg and MTTFd according to EN 13849-1 and EN 6206.

Technical features - Main module Mosaic M1

The main Mosaic M1 module from ReeR has 8 digital inputs, 2 safety outputs, 2 start / restart inputs, 2 programmable digital signal outputs, 4 test outputs for sensor monitoring, LED signaling and a USB interface to connect the M1 to a PC via a USB cable.

Properties at a glance:

  • 8 digital inputs
  • 2 OSSD - PNP 400 mA output current
  • 2 inputs for start / restart interlock and external device monitoring (EDM: External Device Monitoring)
  • 2 programmable digital signal outputs - PNP 100 mA output current
  • 4 test outputs for sensor monitoring
  • LED signaling: Input / output status and fault diagnosis
  • Configuration with PC via USB interface with MSD (Mosaic Safety Designer) software
  • Bus connection with MSC connector (optional)
  • Mosaic configuration memory (optional)
Safety PLC connected with USB Cable - ReeR Safety

Safety PLC with 4 OSSD outputs

The M1 main module has undergone a true transformation. The new main module M1S functions include four independent OSSD safety outputs (up to Pld) or 2 OSSD pairs (PLe) and the possibility to process 128 logical operators, making your security applications more powerful.

The differences between the M1 and M1S modules

M1 + 14 expansion modules

M1S + 14 expansion modules

  • 128 digital inputs
  • 16 inputs for Start / Restart interlock and EDM
  • 8 fieldbus inputs
  • 16 safety outputs
  • 32 status outputs
  • 64 MSD operators
  • 4 Muting operators
  • 32 timer
  • 16 probes
  • 4 security locks
  • 128 digital inputs
  • 32 inputs for Start / Restart interlock and EDM
  • 32 fieldbus inputs
  • 32 safety outputs
  • 48 status outputs
  • 128 MSD operators
  • 8 Muting operators
  • 48 timer
  • 32 probes
  • 8 security locks


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Safety PLC with 14 expansion units

Programmable safety relay - Safety PLC - Expansion units - ReeR Safety

Expandable safety PLC

Communication module

The Mosaic safety PLC from ReeR is also expandable with external modules in addition to the programmable function. The communication module MB is a fieldbus module. You can choose a communication module that operates on the basis of one of the following communication protocols: CANopen, DeviceNet, EtherCat, Ethernet IP, PROFINET, PROFIBUS or a USB interface.

Speed ​​monitoring relay

You can monitor a maximum number of revolutions of carousels or centrifuges with a speed monitoring relay. When the number of revolutions of a machine becomes too high a dangerous situation can arise. To protect machines and persons against unsafe situations and to meet the set standards, a speed monitoring relay is used. Read more about speed monitoring relays.

Extra modules

If the main module M1 has insufficient inputs or outputs, the safety PLC Mosaic can easily be extended with an additional module with inputs or outputs.


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Expandable safety PLC - Mosaic - ReeR Safety
Configurable software - Safety PLC - ReeR Safety

Software (MSD) - Safety PLC

The safety PLC Mosaic from ReeR Safety is easy to program with the free supplied software. The image on the right shows the basic screen of a security system entered in the MSD software. The software works through 'drag and drop'. All different parts can be dragged and moved.

Project reporting and log files

The ReeR M1 main module has a USB connection that allows you to connect the main module to your PC via a USB cable. The software allows to validate the software design in the form of a simulation and project report. The project report contains the name of the project, configuration, safety information (PFHd, MTTFd, DCavg) and the modules, resources and parts used. The software generates a log file with the date when the project was created with the related checksum (CRC 4-digit hexadecimal identification) which is stored in the M1 module.

Mosaic Configuration Memory

If it is a standard security system or largely standard, the 'Mosaic Configuration Memory' is a time-saving solution. A previously programmed security system can easily be transferred to another ReeR M1 module by means of a memory card.


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  • Intuitive software makes it easy to configure without
    knowledge of programming software and combine all safety components to one system with SIL 3/Ple
  • Because of the modular system it is easy to add more modules. For example I/O, remote and bus modules.
  • With remote interface modules it is possible to secure a complete machine line.
  • Exchangable memory so it is easy to transfer software settings with out use of a pc.
  • Speed monitoring for securing the speed or downtime with an encoder or proximity sensor
Configurable safety PLC Mosaic | ReeR
Application example - Safety PLC - ReeR Safety

Applications safety PLC - Mosiac

Using the safety PLC Mosaic from ReeR not only saves cabling in your cabinet, the number of relays can also be reduced by applying the Mosaic. The safety PLC Mosaic is used in the following application examples:


Protection of robot with light curtains