Connection tab
The Connection tab shows information about the connection status and the connected system.
In addition to the display of the connection status and telegram status several counters are available:
Good telegrams
Counter of correctly received telegrams
Bad telegrams
Counter of faulty telegrams
Dropped telegrams
Counter of dropped telegrams
Time between telegrams
The time interval between the last 2 correctly received telegrams.
Expected data ID, received data ID
The IDs are used to identify the received data in ibaPDA. The ID is incremented by every request. The ID in the measurement data telegram must match the ID of the request telegram. Otherwise the data will be dropped.
Data timeout
ibaPDA monitors the telegram counter of the measurement data telegrams. If the counter does not change within the timeout calculated according to the cycle time, the data is set to 0.
System info
System information is displayed in this field, which is read from the PLUSCONTROL CP while testing the connection.
DMA tab
The tab gives information about the image generation (process image). An image is a dataset that the card writes into the PC system memory via DMA. This image contains all data of the measured signals within a sample on that link.
Here is a short description of the image generation information:
Images processed at interrupt:
These counters show how many images were available in the DMA buffer when the last interrupt fired. This value should normally correspond with the interrupt time divided by the image sampling rate.
Images in DMA buffer:
This is the number of images that are in the DMA buffer. This number should remain constant. If this number starts to increase, the system does not work correctly. This may happen if e.g. an interrupt is missed.
Images copied to interrupt buffer:
This counter shows how many images have been retrieved from the DMA buffer and have been processed by ibaPDA. This counter should count up continuously.
DMA buffer empty:
This counter increments each time the DMA buffer is empty when the interrupt fires. If this is the case, then the driver sets all signal values of the respective link to 0 (zero). This may happen if the FO link is disconnected.
Time between telegrams:
Time interval between the last 2 correctly received telegrams This is the same value as the time in the FO communication information but the driver maintains the minimum and maximum values. There shouldn’t be much difference between the minimum and maximum values.
Image sample rate:
The rate at which the board writes images to the DMA buffer. This should be faster or equal to the fastest time base of the modules connected to this link.
Image size:
This is the size of the image in bytes. If you multiply the image size with the image sample rate then you know how many bytes per second are transferred by this link over the PCIe bus.
Dropped images:
A value >0 indicates an overload on the PCIe bus.
DMA buffer size
Fixed value of the card
Memory view tab
The memory view tab displays the DPR memory on the ibaFOB-PlusControl card.
This memory view corresponds to the view in the memory view tab of the card diagnostics when 1: FPGA registers is selected as memory region.