Siemens SIMATIC S5 Equipment Manual page 148

KY = x, y x = Disregard
SPDB :
w
: Output unchanged, and/or
WI : Output unchanged (high word)
W2 : Output unchanged (low word)
KB : Output of identifier bits, and/or
: Output of identifier bits (high word) + channel 2
Output of identifier bits (low word) -t channel 1
ST : Output control bits
Selection of the "verification read BEF = PR" or "calculate average value BEF = MB" special func-
tion using function block FB 157 during cyclic operation is not dependent on the enable identifier
of data word DW 181 or DW 183 in the user data block.
Both commands require valid parameters in data word DW 182 or DW 184 (shown below) of the
user data block before they can be activated.
DW 182/184 Channel no: (O or 16)
The "channel no." parameter is used to select the desired channel. Zero must be entered for chan-
nel 1 and 16 for channel 2. All other entries cause an error message indicated by the '
The command–related parameter "number" must be supplied with a decimal value between zero
and 15. The entry of zero causes the respective special function ("verify–read" or "calculate aver-
age value") to be deactivated. Entry of a number outside the permissible range causes the same
error indication as when an incorrect channel number is selected.
When a parameterization error occurs, function block FB 157 terminates processing without tran-
sferring the parameters to the module.
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Programming Instructions
Number (O to 15)
(
PAFE" para-
9 – 27