- Inputs and the outputs (pii, pio).
- Bit memory (m).
- The timers (t).
- The counters (z).
- The piles of the nearby statistics (l).
Persistence is through method afterglow backup of the information in case of interruption of the energy community. All the statistics from the operating memory, but the reminiscence bits, timers, and the counters have been defined as to make the object of a backup in case of energy failure, are persistent. The afterglow is to shop the records on the cardboard (mmc) in case of outage community and to the restore to restart one time the road voltage has been restored.
Don't forget to store and cargo the brand new configuration into the %.
The clock memories operate asynchronously with regards to the cpu cycle. With lengthy cycle times, the repute of the cadence memory can change for the duration of a cycle.
The reminiscence% m100.1 is flashing with a period of zero.2 seconds. You can alter the price of a reminiscence by way of converting the variety after the period. Ranging from 0 to 7, the frequency varies consistent with the range marked. The desk beneath allows you to make the hyperlinks between the range and the period of its length and frequency.
Retentivity is used to save a country within the occasion of a strength failure. While the strength returns, the state of affairs before the cut is restored. Retentivity is configured inside the houses of the cpu. Through conference the variety of bytes residual is set at 10. For that reason it is the bytes mb0 to mb9 (m0.0 to m9.7) which are retentive
The tab "endurance" to outline the regions of memory retained after a power failure or if prevent to run. In both instances, the s7-300 is "started".
Remanence on counters and timers isn't always viable with iec blocks however most effective with siemens blocks.
The running ram isn't stored, the data it consists of is lost. Only the flags, timers and counters defined as retentive and the retentive areas of the records blocks are saved.
After beginning, this system ought to be reloaded:
From the reminiscence card (if outfitted) or ,
From the programming laptop (with out memory card).
Feature blocks - fb:
They're blocks of code that completely keep their input, output, and input / output parameters in instance information blocks so that they can be accessed even after block processing.
The information blocks - db:
Records blocks (db) are data areas of the consumer application that include consumer data.
structure of the program
Graphically can be represented as;
Online backup > program information > call structure.
In this example, ob1, fc1 and fc2 call fc2 fc3 fc4is called.
cyclical processing of the program
THE CYCLE PROGRAM
- Binary combinatorial operations, and/or
- Usually open , normally closed
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