VMIVME-7750 VMIVME-7750-734001 350-027750-734001 K – GE

Description

VMIC’s VMIVME-7750 features additional capabilities beyond those of a typical desktop computer system. The unit provides four software-controlled, general-purpose timers along with a programmable Watchdog Timer for synchronizing and controlling multiple events in embedded applications. The VMIVME-7750 also provides a bootable Flash Disk system and 32 Kbyte of non-volatile SRAM. Also, the VMIVME-7750 supports an embedded intelligent VME bridge to allow compatibility with the most demanding VME applications. These features make the unit ideal for embedded applications, particularly where standard hard drives and floppy disk drives cannot be used. The VMIVME-7750 also supports I 2C by integrating specialized circuitry for these functions.

In addition to its PC/AT functions, the VMIVME-7750 has the following VMEbus features:

• Complete six-line Address Modifier (AM-Code) programmability

• VME data interface with separate hardware byte/word swapping for master and slave accesses

• Support for VME64 multiplexed MBLT 64-bit VMEbus block transfers

• User-configured interrupter • User-configured interrupt handler

• System Controller mode with programmable VMEbus arbiter (PRI, SGL and RRS modes are supported)

• VMEbus BERR bus error timer (software programmable)

• Slave access from the VMEbus to local RAM and mailbox registers

• Full-featured programmable VMEbus requester (ROR, RWD and BCAP modes are supported)

• System Controller auto detection

• Complete VMEbus master access through five separate Protected-mode memory windows

The VMIVME-7750 supports High Throughput DMA transfers of bytes, words and longwords in both Master and Slave configurations. If Endian conversion is not needed, VMIC offers a special “Bypass” mode that can be used to further enhance throughput (not available for byte transfers). The VMIVME-7750 VMEbus interface is provided by the PCI-to-VMEbus bridge built around the Tundra Semiconductor Corporation Universe II VMEbus interface chip. The Universe II provides a reliable high-performance 64-bit VMEbus-to-PCI interface in one design. The functions and programming of the Universe-based VMEbus interface are addressed in detail in a companion manual titled: VMIC’s Tundra Universe II Based VMEbus Interface Product Manual (500-000211-000).

The on-site instrument equipment includes various sensors, transmitters, actuators, electric doors, etc. that are directly related to production, and belongs to the fault of the on-site layer. The failure of on-site instrument equipment directly affects the control function of the DCS system. In the DCS control system, this type of fault accounts for the largest proportion. Once incorrect parameters appear on the CRT screen, the actuator cannot be adjusted, or the motor cannot start, such faults should be considered first. This type of malfunction is generally caused by the quality and lifespan of the instrument itself, as well as the complex production environment around the instrument.

System failure is a global fault that affects the operation of the system, which is generally difficult to occur. If the system restarts after a fault occurs, it can be restored to normal. It can be called an accidental fault, but of course, it is due to improper system design or program problems, which is another matter. Hardware faults refer to faults in the process control layer, mainly caused by damage to modules in the DCS system, especially I/O modules. This type of fault is generally more obvious and has local effects, such as: the parameter display does not change, and after eliminating the possibility of on-site instrument faults, the actuator and electric door cannot be operated. They are mainly caused by improper use or prolonged use, as well as aging of components within the module.

If the dust, temperature, and humidity around the module exceed the standard, it will greatly shorten the service life of the module. Therefore, considering the strict requirements of the DCS system for temperature, humidity, and cleanliness. Before installation, the civil, installation, electrical, and decoration works of the operation room, especially the process control room, must be completed. If it is in summer, the air conditioning should be activated in a timely manner. In addition, especially in the process control room on the pipeline interlayer, the cable holes in the cabinets must be sealed properly, otherwise, once the pipeline leaks steam and enters the cabinets, it may cause major faults.
Software failures are caused by errors in the software itself. Generally, it occurs during the commissioning phase of the DCS system. Due to the complexity of the application software program and the large workload, it is difficult to avoid application software errors.

This requires thermal and operational personnel to be very careful during the DCS commissioning and trial operation phase, and to promptly detect and cooperate with the DCS system commissioning personnel to solve problems. Such failures are rare after the DCS system operates normally.

Improper operation and use can cause malfunctions. In actual operation, sometimes a certain function of the DCS system cannot be used, but in reality, the DCS system is not a problem, but is caused by the operator’s lack of proficiency or incorrect operation. Therefore, DCS system suppliers should provide DCS operation manuals to operators in a timely manner. Operators who use DCS systems for the first time must undergo training before they can start working.