Siemens SIMATIC 505 - Outputs; Data Transfer Control Bits; Data Identification Bits

Advanced Function Programming
3-10
SIMATIC 505–2556 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 505–2556 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.
 1"-$&*$ -"."/
 "."/. 1"-$&*$ +* (( %**"(. /+ *"2 1(0". (+!"!
 (("3 %+(! -"."/
 "."/ 1(("3 %+(!
 "' %+(! -"."/
 "."/ ,"' %+(!
 "! ,"' %+(!1(("3 %+(!
 "! 1(("3 %+(! 1(0".
 "! ,"' %+(! 1(0".
 "! ,"' %+(!1(("3 %+(! +- "! #($.
 "! #($.
 "! ,"' %+(!1(("3 %+(! 1(0".
 * +,"-/&+* /%" .//" +#  !"/"-)&*". 2%"/%"-  — 
-"/0-* ,"'1(("3 !/ +- /%" #($ &/. !"#&*"! &* &$0-" 4 #  &. +*
/%"* /%" /3," +# !/ 1(("3 %+(! +- ,"' %+(! &. ."(" /"! 2&/% 
  +*/-+(("- /+ )+!0(" !/ -"!3 #($
 *+ !/
 !/ -"!3 /+ /-*.#"-
Figure 3-5 Data T ransfer Contr ol Bits
Outputs