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Siemens SIMATIC S5 Equipment Manual

Siemens SIMATIC S5
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R
02/92
Programming Instructions
9.4.7 Use of the Function Block
The module must be parameterized with function block FB 156 before function block FB 158 can
be called.
The parameter transfer is performed via the working data block. The function to be executed by
function block FB 158 is selected by entering the appropriate command code in format KS in data
word DW n.
Before a new command is entered in data word DW n in the working data block, a check must be
performed to determine whether the contents have been deleted by function block FB 158 (DW n
KH = 0000). The procedure is shown in the following
pictogram.
Contents of data word DW n in working data block equal zero?
Yes
I
No
I
Write new command in DW n
Call function block FB 158
Calling function block FB 158 with KH = 0000 in data word DW n of the working data block causes
the block to be exited without triggering a function (idling).
1P
241 Equipment Manual
@
.Siemens
AG
1989, Order No.: 6ES5 998-0KD21
9 – 37
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Siemens SIMATIC S5 Specifications

General IconGeneral
Product type designationSIMATIC S5
Programming languageSTEP 5
Digital inputsVaries by model
Digital outputsVaries by model
Analog inputsVaries by model
Analog outputsVaries by model
Supply voltage24V DC
CPU TypeVaries by model
MemoryVaries by model
Digital I/OVaries by model
Analog I/OVaries by model
CommunicationPROFIBUS
Operating Temperature0°C to 60°C
Relative Humidity5% to 95% (non-condensing)

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