ABB XVC768AE105 3BHB007211R0105 Voltage input module

Advanced communications settings are available under the Communication Method tab to allow different methods of communications to be utilized (shown in Fig 4.6). The version 7 (and higher) drivers and .DLL’s allow for three different methods of communications: Interrupt, Stall, and Delay.

The Galil Windows Servo Design Kit includes advanced tuning and diagnostic tools that allows the user to maximize the performance of their systems, as well as aid in setup and configuration of Galil controllers. WSDK is recommended for all first time users of Galil controllers. WSDK has an automatic servo tuning function that adjusts the PID filter parameters for optimum performance and displays the resulting system step response.

Interrupt Communications Method 

The interrupt method overall is the most efficient of the three methods. The software communications method uses a hardware interrupt to notify the application that a response or unsolicited data is available. This allows for greater efficiency and response time, since the drivers do not have to “poll” the buffers for the data. Additionally, the interrupt method allows for data record caching. The interrupt method uses bus level interrupts (IRQ) from the controller to notify the PC that data is available. This requires that the Controller be configured with a valid interrupt line. For DMC-18x2 controllers the interrupt is configured automatically. Firmware version 2.0m (and greater) is required for the “communications interrupt” method to be available. For complete information on the different communications methods, select the More Info button on the Communications parameters dialog box.

Stall Thread and Delay 

Thread Methods Users can also choose between "Delay" and "Stall" methods. These two methods are available for the DMC-18x2 controller and affect how the software "waits" for a response from the controller when a command is sent. If a controller is configured with the "Delay" method, the thread waiting for a command response gives up its time slice, allowing other processes running on the operating system to proceed. This method can slow communication, but results in negligible CPU utilization. The second method, the "Stall" method, uses the opposite strategy. The thread that performs I/O with the controller maintains ownership of the CPU and polls the controller until a response is received. This approach is essentially the same method employed in previous versions (< V7) of the Galil communication DLLs and drivers. While the "Stall" method does not have to wait for its thread to become eligible for execution, it does result in 100% CPU utilization while communicating with the controller.

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