VMIVME-7459 modular

Description

The VME-7459 is a versatile mass storage module for use with our line of VME processors. The VME-7459 is available in a variety of configurations that include writable compact disc, read-only compact disc and up to 60 Gbyte hard disk storage. The assembly will support one compact disc drive and one hard disk drive for connection to a single IDE interface.

Connection via VMEbus P2

Single slot (4 HP) form factor

VMEbus IDE CD/DVD and optional hard disk drive module or CompactFlash

It can be seen that the software model is sufficient to image various actual systems: for a small system with only one processor, the model has only one configuration, one resource and one program, which is completely consistent with the situation of most PLCs today. For medium and large systems with multiple CPU modules plugged into the same rack, each CPU module is considered as a configuration, which can be described by one or more resources, while one resource includes one or more programs. For a distributed system, it includes multiple configurations, and a configuration includes multiple processors. Each processor is described by a resource, and each resource includes one or more programs.

It is worth noting that the multi CPU PLC structure, which has become popular in Japan in recent years, came out many years after the IEC 61131-3 standard was issued. The revolutionary change of the PLC structure is obviously based on the theory of this software model. Otherwise, the PLC is still a traditional structure in which a CPU executes a program by scanning.

As for the exchange of procedures, at least so far, it is still a direction of efforts. Only when the PLC products provided by each PLC supplier truly comply with the IEC 61131-3 standard, and the specific implementation of its programming system actually complies with the IEC 61131-8 Guidelines for the Application and Implementation of Programming Languages, and through the consistency test of PLCopen, an international organization, on various programming languages (LD, SFC, FBD, ST and IL), should the corresponding exchange of storage address resources of different PLCs be solved, It is possible to realize program exchange worthy of the name.

VMIVME-7459