Hollysys FM820 Unit control module

The following instructions can only be made if the keyswitch on the process communication keyboard has been set to position 2 or 3 (See Chapter 2.2). These keyswitch positions enable the configuration keyboard so that function blocks can be configured and new blocks (e.g. PICTURE) be created.

This instruction is required for setting the default values and must be transferred prior to the following instructions: – Inserting a block E,...; – Deleting a block AUS,...; – Output of block processsing sequences B;  Error message F 421 is issued if ZYK has not been selected when these instructions are given.

Definition of a block

 The block name may consist of four alphanumerical characters. Special characters and symbols are not permitted (documentation uploading). When defining a block to an already existing function block, the original parameter record of this function block is copied (data record). Several blocks can be defined one after another without the necessity to install them in the processing sequence immediately

Definition of the closed–loop controller block no. 11. F 432 is issued if a second attempt is made to define the same block. Exceptions: GB1 to GB8, GM1 to GM8, GT1. These blocks are contained in the system as a standard feature (with minimum length); they are created in the required length during redefinition.

Inserting a block 

The instruction “ZYK,...;“ must be used for presetting the system before a block may be inserted in the processing levels.Inserting the defined or displayed block in the first location of the selected processing level. E; Inserting the defined or displayed block after the last block to have been inserted. The name of the last block to have been entered is displayed to the right of the selected cycle.  Insertion is performed after the first block which is identical to the block specified in the insert instruction. This is important if the specified block is contained more than once in the processing sequence.

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