Disk I/O Device Setup

Topology > I/O Devices > Configure a Disk I/O Device > Disk I/O Device Setup

Disk I/O Device Setup

To set up communications with a device, follow the basic steps given in the I/O Device setup procedure below.

Sometimes you might need to edit the communications forms directly. They require the following specific information.

You are not required to complete a Boards dialog box.
You are not required to complete a Ports dialog box.
Complete the I/O Devices dialog box as follows.

Perform the setup by entering the following information:

Text Box	Required information
I/O Device name	A name or your Disk I/O Device, for example: DISK_PLC. Each I/O Device needs to have a unique name in the Citect SCADA system.
I/O Device number	A unique number for the disk I/O Device (1-4095). Each I/O Device needs to have a unique number in the Citect SCADA system.
I/O Device address	The path and filename of the disk file, for example: [RUN]:DSKDRV.DSK If you are using redundant disk I/O Devices, specify the path to both the primary file and the Standby file in the configuration of both disk I/O Devices. For example, if this is the primary disk I/O Device, enter: `Primary_File, Standby_File` If this is the Standby Disk I/O Device enter: `Standby_File, Primary File` Primary_File is the name (and path) of the primary disk I/O Device file. You may use path substitution in this part of the field. Standby_File is the name (and path) of the Standby Disk I/O Device file. You may use path substitution in this part of the field. Notes: If the specified disk I/O device file is not found, Citect SCADA creates a new (empty) file with the specified filename. To use redundant disk I/O devices, you need to use a network that supports peer-to-peer communication. Disk files need to have write permission (on both primary and standby servers). The frequency with which Citect SCADA writes data to the disk I/O device(s) is determined by the [DiskDrv]UpDateTime parameter.
I/O Device protocol	To use the Citect SCADAgeneric protocolA pseudo-protocol supported by disk I/O devices that provides a convenient way to represent disk data. The generic protocol is not a real protocol (communicates with no physical I/O device)., enter: GENERIC - or - To select a specific protocol supported by Citect SCADA, see the I/O Devices online Help.
I/O Device port name	You need to use: DISKDRV
I/O Device comment	Any useful comment.
I/O Device startup mode	If not using redundant disk I/O Devices, leave this property blank. If you are using redundant disk I/O Devices, use either: Primary: Enable immediate use of this disk I/O Device StandbyWrite: This disk I/O Device will remain unused until the computer with the primary disk I/O device configured becomes inoperative. Every write request sent to the primary disk I/O Device is also sent to this disk I/O Device. To use StandbyWrite mode, you need to also configure an I/O disk device in the primary server. Both I/O Devices need to have the same I/O Device name and number.
I/O Device Log Write, Log Read, Cache and Cache Time	Leave these properties blank.