Mitsubishi Electric’s modular PLC series MELSEC iQ-R is now available as a fully redundant pair of controllers for high performance and extra reliability. To help reduce the total cost of ownership (TCO), the system also integrates various features into the PLC for monitoring and managing safety. In recent years, compliance with international safety standards has become an essential requirement across global markets. In addition, quick recovery from control system breakdowns has emerged as a common necessity.
Many key production applications require full redundancy conforming to the IEC 61508 SIL 2 standard, so critical systems can still operate in case of a failure or accidental damage to the primary CPU unit. The MELSEC iQ-R redundant pair of PLCs comply with the functionality requirement of this standard, which is certified by TÜV Rheinland® to meet global needs. The guidelines within the redundancy standard necessitate a full duplicate PLC rack with all modules, which the primary set will switch-over to instantaneously.