MELSEC QS Safety PLC

Safeguard large systems while remaining cost effective. That’s the key promise of the QS Safety PLC. In the past, production lines were protected by “islands” of safety control; typically dedicated safety relay panels. While safe, this approach suffered from many of the same disadvantages that lead to replacement of conventional relay panels many years ago. A safety relay panel is expensive to build, difficult to change and slow to troubleshoot. The QS offers a modern approach to safety by combining a distributed I/O network with the flexibility of a modular controller. This offers the capacity to cover an entire production line, while bringing the benefits of reduced wiring, rapid diagnostics and easy program modification and maintenance. Of course, since this is a safety controller however, there is a full complement of safeguards against system failure and unauthorized access. A SIL 3, Category 4 certification completes the picture.

Safety CPU module Safety main base unit Safety power supply unit Safety network Safety I/O module

Specifications

	QS Safety PLC
I/O capacity	6144 (max 1008 safety I/O)
Program memory capacity	14 kSteps
Basic instruction execution time	0,10µs
I/O	Distributed I/O blocks on CC-Link Safety
I/O types available	3 types (8 dual in/4 dual out; 8 dual in; 4 dual out)
Diagnostic capabilities	3000 records for operation and error messages
Network connectivity	CC-Link Safety, CC-Link IE, MELSECNET/H, Ethernet
Safety certifications	IEC 61508 SIL 3, ISO13849-1 PL e (EN 954 Category 4)