Advanced Function Programming
3-10 SIMATIC 505–2557 Installation and Operation Guide
Internal Register Structures (continued)
The
discrete output points consist of Y17 – Y32.
Y17 – Y19 are used to identify the data being transferred. As data is loaded
to the module, the state of these bits identifies the type of data being
transferred (see T
able 3-6). The SIMA
TIC 505–2557 module decodes these
bits and processes the data accordingly
.
T
able 3-6
Data Identification Bits
Y19 Y18 Y17 Data Transfer Type
000No operation
001Function enable bits
010Low/High alarm setpoint values
011Scaling low/high values
100Filtering time constant/Number of
averages
In
addition, Y27 – Y32 are used to reset averaging, reset valley hold values,
reset peak hold values, read peak or valley values, read flags, and to write
data to the module. See Figure 3-5.
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"! 1(("3 %+(! 1(0".
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"! ,"' %+(!1(("3 %+(! +- "! #($.
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* +,"-/&+* /%" .//" +# !"/"-)&*". 2%"/%"- —
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+*/-+(("- /+)+!0(" !/-"!3 #($
*+ !/
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Figure 3-5 Data
T
ransfer Contr
ol Bits
Outputs