The products of the PLC Simulators line are the basic tools for checking out applications connected to the PLCs. The simulators are compatible with the better known supervisors on the market.
The development of supervision applications and man-machine interface includes, by definition, the involvement of one or more PCs and one or more peripheral units (PLC, CNC, etc.). The functional test of the supervision application, once the peripheral is connected, consists in verifying the compatibility between events (actions) and behaviour (reactions). A simple example could be the link between the colour of a graphic object in a page and a bit of a word of the peripheral. To check whether the graphic object changes colour depending on the bit, a way must be found to modify the bit and the desired effect checked on the video. A PC, a PLC and a hardware signal simulator are required to make these checks; moreover both the supervision application and the PLC program must have been developed.
The PLC communication simulators permit a much more practical and rational approach consisting in the use of two PCs: one for the supervision application and the other to simulate the presence of the peripheral. Operating conveniently on the simulator it is possible to modify the value of words or bits and check the effect on the supervisor. The simulators can simulate several PLCs with a single PC. When systems are to be developed with many PLCs connected to the supervisor, testing out the application becomes even more critical. By using the software simulator it becomes possible to make the supervisor work in very much more similar conditions to the final system ones.
In general, PLCs must comply with certain basic rules of an economic nature:
Even if intending to infringe some of these rules, it is important to remember that, for complex systems, the physical presence of three, four, five or more PLCs is, in any case, limited at the time of installation.
Since the simulator makes the test phase possible even without PLCs, the development of the supervision application is not constrained by the actual availability of the PLC.
Why Simulators ?
Simulators are easyThe use of a PLC communication software simulator is extremely simple. It does not even require specific knowledge of PLC programming. The simulator makes few demands in terms of CPU and memory: a 386 is adequate to operate it without major problems.
Simulators are convenientThe software simulator allows one to be immediately operational; there is no need to bind the start of work for developing the supervision application to the availability of the PLC.
Simulators are flexibleIt is easy to fine-tune the supervision software with a simulator. It is extremely simple to change the type of peripheral; it is even possible to simulate PLC networks on a single serial line.
Simulators are, at times, indispensableWhen systems with many PLCs are to be dealt with, simulators allow the system to be perfected right from the development stage. Once the system is installed, simulators become indispensable to permit continuing testing in the case of malfunctions encountered directly or suffered by the end user.
Simulators are not confined to the use of Super-FlashSince they are external peripheral simulators, they can be potentially used with any man-machine interface or supervision system. They can be equally useful for those who develop their own software or for those who use operator terminals dialoguing with PLCs.
Simulators, general featuresPLC communication simulators allow the values of the internal PLC resources (words, flags, etc.) to be displayed efficiently. In general, simulators permit:
For each simulated resource Type it is possible to:
Simulators, the productsThe PLC communication simulators currently available are listed below. Production of simulators, however, is always active. Therefore simulators not mentioned in this list could also be available. Version numbers are not quoted in the list because they are liable to rapid change.
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