Internal Register Structures (continued)

Outputs

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.

 

Table 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.

￿27

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Figure 3-5 Data Transfer Control Bits

3-10 Advanced Function Programming

SIMATIC 505±2557 Installation and Operation Guide

Page 40
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Siemens 505-2557 installation and operation guide Outputs, Data Identification Bits