Siemens SIMATIC S5 Equipment Manual page 147

Programming Instructions
SPDB: KY = x, y x = Disregard
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) + channel 1
: Output control bits
ST
During cyclic operation, the "inhibit interrupt depending on direction BEF = RV" command can be
used to inhibit one of the two interrupt directions. This can also be done when data word DW 185
of the user data block has identifier KH = FFFF.
The assignment of data word DR 186 from the user data block in which the desired "inhibit direc-
tion" of the interrupt for one or both channels must be selected before the "BEF = RV" command is
activated is shown below.
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I I
O 0 Enabled for both directions
O 1 Inhibited, backwards
10 Inhibited, forward
1 1 Inhibited, both directions
R 02/92
AG 1989, Order No.: 6ES5 998-0KD21