Generic NOV / DP-RAM
To implement 3rd party PC cards with DP-RAM interface into TwinCAT, it is possible to use the generic NOV/DP--RAM device under "I/O Devices" -> Append Device | Miscellaneous.
Context menu
Delete Device... <Del>
Removes the DPRAM interfaced fieldbus card and all subsidiary elements from the I/O configuration.
Online Reset
Initiates an online reset on the Fieldbus.
The "Generic DPRAM" tab
PCI Slot/Irq: Displays the card address (below 1 Mb for an ISA card) or, in the case of a PCI card the logical PCI slot where the card is located along with the IRQ that has been assigned to it. The IRQ is unused.
Length: It is possible to modify the length of the memory area here, but this should only be done for ISA cards. It is read out automatically for PCI cards.
Search...: This is used to search for the address of the PCI card according to the vendor ID, device ID and the base address.
PCI-Vendor ID: The PCI vendor ID is entered here
PCI-Device ID: The PCI device ID is entered here
PCI BaseAddr: The appropriate memory area is selected here. (A PCI chip can address up to four memory areas, corresponding to the PCI chip's base addresses 2-5. Base address 0 and base address 1 are used for the PCI registers, to which access has not in the past been possible.)