Siemens 505-2557 Manual Do Utilizador

Advanced Function Programming

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 Table 3-6). The SIMATIC 505–2557 module decodes these
bits and processes the data accordingly.

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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