GuardLogix, S7-1500F and the PL/SIL basics: safety inputs, muting, reset logic and how a safety task differs from the standard one.
The guard on the case packer came off its 440R-S12R2 on a Saturday and went onto a 1791ES-IB8XOBV4 under a GuardLogix 5580, same tongue switch, same two 100S-C09 contactors, and the first time the door was closed the DCS instruction reported Fault Code 16#4000 and would not take a reset. Channel A active, channel B … Read more
The infeed conveyor’s GuardLogix 5580 consumes one safety tag from the case packer’s 5580, CP_Safe, and at 02:04 every night for a week CP_Safe.ConnStatus.ConnectionFaulted went to 1 for between two and nine seconds, the consumed data went to zero, the conveyor’s CROUT dropped its contactors, and the shift lead reset it and wrote “network” on … Read more
How functional safety works on a PLC job: the ISO 13849-1 risk graph, PLr, category 3 architecture, MTTFd, DC, CCF, a PFHd budget and SISTEMA.
When a standard interlock is not enough, how to wire and configure a dual-channel E-stop on GuardLogix safety I/O, and the reset rule nobody may break.
How the BPCS, the SIS and the package PLC split the work on a batch reactor, with a cause and effect matrix, cascade temperature control and IS barriers.
Zone accumulation, cascade start and stop, jam timers that do not nuisance trip, and driving a PowerFlex 525 over EtherNet/IP from a CompactLogix.
IEC 61508; Covers the international standard for all applications involving protective functions created with the help of electrical, electronic, and programmable electronic devices. The IEC 61508 standard specifies requirements regarding the design, integration, operation, and maintenance of the system in order for a system to provide the required SIL level. PLC Programming Standards The IEC … Read more
Safety Add-On Instructions Like standard Add-On Instructions, safety Add-On Instructions let you encapsulate commonly-used safety logic into a single instruction, making it modular and easier to reuse. In addition to the instruction signature used for high-integrity Add-On Instructions, safety Add-On Instructions feature a safety instruction signature ID for use in safety-related functions. Refer to the … Read more