PSSSBBRIDGE-301131 Pilz Safety Digital I/O Module

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Essential details：PSSSBBRIDGE-301131 Pilz Safety Digital I/O Module

With the development of technology, the continuous trouble-free operation time of industrial control systems has been greatly extended. But equipment will always Fail, and when that happens, people want to have a technology that can guarantee the safety of equipment and people, and this technology is called fail-safe technology.

Specifically, fail-safe technology is a technology that can guide equipment to a safe state or position when a failure occurs. Fault safety technology was first used in railway signal system, and now it is widely used in many industrial control systems.

A system that uses Fail-safe technology is called a fail-safe system. A Fail-safe system is used in scenarios with high security requirements and consists of a Fail-safe CPU and fail-safe module.

The fail-safe CPU is certified by TuV (a German security organization). Ensures that the control system switches to safe mode in case of failure. The name of the Siemens S7 series Fail-safe CPU is followed by the letter “F”, for example, CPU319F, where “F” stands for fail-safe. In order to distinguish from ordinary cpus, fail-safe cpus (F-cpus) use yellow labels in both module and hardware configurations, as shown in the following figure CPU319F-3PN/DP, which you can see: TuV security certification and the yellow TAB in the lower left corner.

The fail-safe CPU can run fail-safe programs. A fail-safe program consists of one or more safe operating groups that evaluate the system inputs and control the system’s safe outputs independently of the normal program. Therefore, the fail-safe CPU also needs the cooperation of the fail-safe module.

The so-called “fail-safe module” refers to the module that can guide the system into a safe state when a failure occurs. The fault safe module has many applications in the Distributed control system. The difference between it and the ordinary module lies in its internal dual-channel design. The two integrated processors monitor each other and automatically test the IO loop, and put the module in a safe state after the fault occurs.

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Fail-safe power module (F-Power) is used to provide working voltage for other modules and can safely cut off the working voltage of the output module; The fail-safe digital input module (F-DI) is used to record the digital signal status of safety-related sensors and transmit the fail-safe information frame to the fail-safe CPU (F-CPU). The fail-safe digital output module (F-DO) is used to provide short circuit or serial protection and safely shut down the actuator; The fail-safe analog input module (F-AI) is used to acquire signals from safety-related analog sensors. Each fail-safe module communicates with the fail-safe CPU through the fail-safe bus protocol, and the failure of communication will cause the fail-safe module alarm.

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