ABB 5SHX0660F0002 Thyristor module

Starting the Acyclic Processing Levels 11 and 15 Processing level 11 is started cyclically every 8 seconds. Additional starts are initiated by interrupts from the I/O bus or by a write access to an analog or binary variable with alarm code. The alarm code is set by the system in conjunction with an XA block installed in level 11. It is also possible to set or clear alarm codes of variables via WE/MB operation. Incorrectly set alarm codes cause processing level 11 to start unnecessarily, and thus cause increased processor load. Processing level 15 is executed permanently, on condition that all program functions with a higher priority have been completely processed. The higher priority processing levels may be overloaded if level 15 is not processed at all or only occasionally. Remedial action: Reduce processor load/re–configure.

Processing level Block Sequence Processing 

The block sequences in processing levels 11, 12, 13, 14 and 15 are executed in linear manner from the first to the last block. This linear processing sequence is only interrupted where XA or XB blocks have been installed. XA and XB blocks are scanned to determine whether they have been switched on or off with regard to the current processing cycle. If a block has been switched off, the whole block sequence down to the next XA/XB block is skipped, without any processor activity taking place. For levels 11 and 15, it is important to note that the cycle offset of the XB block is not effective. The block merely switches on or off. The same block may be used several times in all processing levels, except XA/XB blocks. A block is always inserted after the previously inserted block. All blocks will be removed if a repeatedly installed block is removed. Installation in a processing sequence is not possible for any of the data blocks or for the blocks FUTA, TANZ, TUEB, RNAM and GP.

The processing time available for levels 11 to 15

 is subdivided in the following manner (the period of time considered lasts 1 second, for ZYK 2 also): – Alarm level 11, ZYK 1 Alarm level 11 (highest priority level) interrupts level 12 to 15, if required. The remaining time for levels 12 to 15 is reduced according to the time consumed for level 11. – The time for levels 12 to 14 is subdivided in time slice fashion. Levels 12 and 13 from a time slice 1.1, levels 9, 10 and 14 a time slice 1.2. Execution within time slice 1.1 follows the priorities: 1st: level 12 (ZYK 2) 2nd: level 13 (ZYK 3) The execution sequence within the time slice 1.2 is: 1st: level 9 (only accessible from the system) 2nd: level 10 (only accessible from the system)

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