HOW TO TEST SCREEN WITH CITECT CODE

In terms of operator interface, this also means that the operator would then be able to see one display page on-screen driven by different clusters at different times based on the operator's command. It also means that once one project has been tested, duplication of this project ensures roll-out of any number of systems without having to test each of those duplicate systems. This ensures simpler and faster scaling up of systems. With a clustering approach, organisations also have the ability to utilise the same configuration for a project multiple times and have the configuration automatically duplicate for each cluster. What it also does is it raises reliability levels by guaranteeing access to alarms, trends, reports or tags at each site/location. This approach could be used when the need is to increase overall system capacity, spread system load and still ensure that system functionality is close-to-process. That is when the degree of customisation increases.Д¬lustering can also be used to split a system or systems to create reliable sub-systems or sub-clusters maintained through a centralised set of servers. The challenge here is when there are duplicate names for tags, trends or events across systems that need to be combined. By creating a single unified list of alarms across systems and a single view of trends across systems, the operator is able to act on any incidents or exceptions across systems. The traditional application of clustering is in combining sites or systems.

This means clustering retains redundancy without the need for standby servers on each line or machine. With clustering, one centralised server would act as standby for all production lines servers. Clustering achieves this by working on a process-basis rather than machine-basis.ДЄ simple example that illustrates the benefits of Clustering is a process control environment with a number of production lines, each having a pair of servers (one primary and one standby). Organisations can cluster alarms, trends, reports or I/O tags such that multiple systems that were once monitored by multiple operators can now be viewed and monitored by one operator across those systems. In a process control environment, clustering is combining multiple SCADA systems to provide a single unified operator interface. Clustering can also be used to split sites into reliable sub-clusters to increase overall system capacity or spread system load. When combining sites, the clustering approach reduces the cost of control rooms as well as the manpower at those centres without compromising on close-to-process system functionality. Through clustering, process environments can reduce the high costs associated with multiple redundancies in hardware, while still ensuring server availability. How best can the process control engineer centralise operations without raising network reliability risks or losing localised system functionality? How best to leverage the control system most effectively even while attempting to reduce redundant hardware costs?Д¬lustering is an answer to all these problems. Tag values can be used with the Cicode Variable data types.In any process control system there is requirement to strike a balance between the need for centralisation and the need for localisation. Citect SCADA strings can only be stored in contiguous blocks (consecutive registers), and are stored as an array.ДЄ Cicode variable of INT data type can be used to store Tag data types: BCD, BYTE, DIGITAL, INT, UINT, LONG, ULONG and LONGBCD.ДЄ Cicode variable of the QUALITY or TIMESTAMPДata type can be used to store the Tag quality and timestamp items. However, if your I/O device does support integer data types, Citect SCADA can use these integer registers to store ASCII strings in your I/O device. When you are using a disk I/O device, you can also specify a string data type for storage of recipes, or for operator display information. If no NULL character is present, Citect SCADA reads (and displays) any extra characters in memory, after the end of the string.

All strings needs to be NULL-terminated in the I/O device, as Citect SCADA uses the NULL character to check for the end of a string.

HOW TO TEST SCREEN WITH CITECT CODE

You can use strings to store text data (for example, from a bar code reader). While numeric variables are more common, some I/O devices also support ASCII strings. For example, string will appear as 'A B' so cache loading continues to operate. Note: Non printable characters within string tag values will be substituted with spaces. Tags in Citect SCADA hold data values that can be defined as one of the following data types. System Model > Variable Tags > Tag Data Types Tag Data Types

How to test screen with citect