B&R工控机7DO138.70模拟输入量模块

B&R工控机7DO138.70模拟输入量模块

B&R 7DO138.70 VMEbus接口-VMIVME-7697VMEbus接口基于Universe II来自的高性能PCI到VME接口新桥/苔原。系统控制器-车载VMEbus系统控制器功能允许板作为一个整体运行插槽1控制器，或者当另一块板被打开时，它可能被禁用充当系统控制器。

系统控制器可以是编程为提供以下仲裁模式：循环（RRS）单电平（SGL）优先级（PRI）系统控制器提供SYSCLK驱动器，IACK*菊花链驱动程序和VMEbus访问超时定时器。系统控制器还提供仲裁如果在指定时间段内未看到BBSY*，则超时发出BGOUT*信号。

该时间段可编程用于：16或256s。VMEbus请求程序-微处理器可以使用任何VMEBU请求并获得总线控制软件控制下的请求行（BR3*至BR0*）。这个可以对请求者进行编程，使其在以下任何情况下操作：以下模式：按要求发布（ROR）完成后释放（RWD）VMEbus捕获和保持（BCAP）

B&R 7DO138.70 VMEbus Interface -VMIVME-7697VMEbus interface based on high performance PCI to VME interface from Universe II New Bridge/Tundra. System Controller - The onboard VMEbus System controller feature allows the board to operate as a single slot 1 controller, or it may be disabled to act as a system controller when another board is turned on.

System controllers can be programmed to provide the following arbitration modes: Loop (RRS) Single-level (SGL) priority (PRI) System controllers provide SYSCLK drivers, IACK* Daisy chain drivers and VMEbus access timeout timers. The system controller also provides arbitration to issue a BGOUT* signal timeout if BBSY* is not seen within a specified period of time.

The time period can be programmed for: 16 or 256s. VMEbus requester - The microprocessor can use any VMEBU request and get the request lines (BR3* to BR0*) under the control of the bus control software. This can program the requester to operate in any of the following situations: The following modes: Release on demand (ROR) Release upon completion (RWD) VMEbus Capture and Hold (BCAP)