en.Wedoany.com Reported - Pilz recently released the second-generation Safety Ethernet Connection function block (SEC2) for safety communication between the PSS4000 automation system and the PNOZmulti safety control system. This function block has received TUV certification and can achieve the highest safety levels of ISO 13849 PL e and IEC 61508 SIL 3.
In industrial safety system deployment, application scenarios such as unmanned warehousing face limitations in two common modes. One is the centralized control mode, where the overall system of the warehousing area and the safety control of all AGVs are handled by a single safety PLC, with the AGVs sending safety signals through I/O substations. This mode is relatively simple to deploy, but if the PLC fails, all equipment in the entire warehousing area will shut down, affecting overall system availability. Additionally, the safety control logic for both the AGVs and the overall warehousing area is concentrated in a single PLC, making program maintenance extremely complex for large projects with hundreds or even thousands of AGVs. The other mode is separated control, where the overall warehousing area system is implemented by one safety PLC, and AGV safety is managed by other safety controllers. While this mode improves system availability, if the wireless communication between the two independent systems cannot achieve a high safety level, the safety function of the warehousing safety system to stop internal AGVs will not meet standard requirements.
The SEC2 function block addresses these issues by enabling cross-system coordinated control between different safety systems. In the overall warehousing area, users can use the PSS 4000 safety system to monitor safety states such as emergency stops, safety doors, and light curtains, while using a small PNOZmulti safety system in AGVs to monitor safety states such as emergency stops, scanners, speed, and servo STO. Communication between the two systems is achieved through the SEC2 function block and wireless routers at a high safety level, ensuring that a failure in any system does not affect overall system operation. The SEC2 function is based on the Modbus TCP protocol at the bottom layer, is unaffected by network communication devices, and supports wired, wireless, and fiber optic network equipment.
The launch of the SEC2 function block solves the challenge of high-reliability wireless communication between distributed safety systems, providing technical support for flexible deployment in scenarios such as smart manufacturing and intelligent logistics.
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