User manual

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
0 0 0 No operation
0 0 1 Function enable bits
0 1 0 Low/High alarm setpoint values
0 1 1 Scaling low/high values
1 0 0
Filtering 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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Figure 3-5 Data T ransfer Contr ol Bits
Outputs