Siemens Simatic Ident Function Manual page 22

Setting parameters for blocks
3.3 General structure of the function blocks
General sequence when calling the blocks
Note
Different sequences with the Ident profile and standard profile V1.19
Note that the sequence of the Ident profile is not the same as that of the previous standard
profile V1.19. Standard profile V1.19 is not compatible with the RF600 readers.
Case
①
Case
②
Case
③
Figure 3-4
How the blocks work
You can only ever send one command or one command chain to the reader or
communications module. You can, however, call and start two or more blocks at the same
time. The blocks execute in the order in which they are called.
This does not apply to the Reset blocks. If a Reset command is executed, the command
active at this time is aborted.
Note that Ident blocks always have to be executed completely. If execution is cancelled while
a block is being processed, you first need to end this block after the cancelation before other
blocks can be started.
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By setting EXECUTE (EXECUTE = 1) the function/instruction is started. If the job was com-
pleted successfully (DONE = 1), you need to reset EXECUTE. DONE is reset at the same
time.
EXECUTE is set for only one cycle. As soon as BUSY is set, you can reset EXECUTE again.
If the job was completed successfully, DONE is set for one cycle.
Handling as in Case 1, however with error output. As soon as ERROR is set, the precise
error code is available in the STATUS output. ERROR and STATUS retain their values as
long as EXECUTE is set or for one cycle if EXECUTE was reset before the block was ended.
General sequence when calling the blocks
Ident profile and Ident blocks, standard function for Ident systems
Function Manual, 10/2018, C79000-G8976-C387-04