DATA STORAGE

In the same way that a RTU requires storing certain data values ​​the process as field meters intervals hits, the MTU required to maintain certain types of data. MTU's ability to pass the information to the level of supervision can be disqualified for failure of the monitoring station. Therefore, during the time the monitoring station is inoperative, the MTU must store the information RTU? S. To this end, the system should be designed to store data for a while until he recovers prudent monitoring station.

Figure 6

The stored information must be relevant and allow the operator to take decisions based on historical data that is in the process. An example is the use of trend graphs for the analysis of the characteristics of the process.

The best method for storing data is to use a relational database directly from the MTU receives the data and is stored in ODBC format that allows this data is subsequently analyzed by another Microsoft application such.

Below is a procedure for choosing the most appropriate equipment to fulfill the role of MTU. This selection criterion is part of a national provider.

CONNECTION MONITORING SYSTEMS

When you know that with one or two key can stop the production process, it is necessary to take into account the levels of security that we assign to our monitoring system. Companies generally establish policies to define certain levels of access to the monitoring system so that an unskilled operator can stop the process.

The monitoring system as far as possible avoid being a complex system that prevents the operator can take care of this system. That is why graphic displays should be as far as possible, quite friendly. Among the options you should have a monitoring system will:

• Generation and maintenance production reports automatically.

• Detection of events.

• Ability to solve simple math to release a function of the MTU.

SELF-TEST QUESTIONS

1. Is an MTU the only station that can initiate a conversation with another station?

a. Yes, if the model works with master - slave.

b. No, in any case.

c. The RTU starts the conversation.

d. The conversation is handled by the DCE.

e. None of the above.

2. At MTU, do not connect any signal from the process?

a. Yes.

b. No.

c. Only the RTU is connected to process signals.

d. Depending on the characteristics of the MTU, you can connect some signals

the process.

ANSWERS TO QUESTIONS OF SELF

1) to

2) d