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Siemens SIMATIC S5 User Manual

Siemens SIMATIC S5
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S5-115F Manual Blocks
6.1.4 The FB 252 Block Transfer Block
FB 252 handles control of data transfer between the CPU and the CP 523 serial input/output
module. FB 252 transfers fixed-length data. Up to 32 data blocks of eight bytes each are read out
of or written into the memory area per call. Memory areas are data blocks or flag areas.
Memory type of
source/destina-
tion in the case
of S/R
Parameter Meaning Type
Data
Type
Assignment STL
BADR Initial module
address
D KF 128 to 248
(in eight-byte steps)
: JU FB 252
NAME : AGF: BLUE
BADR :
FUNK :
TYP :
DBNR :
ANFA :
BLCK :
Function
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FUNK D KC S: = Send data
R: = Receive data
TYP D KC
Block numberDBNR D KF In the case of data block: 4 to 255
In the case of flag area: 0
in the case of indirect block
Initialization: 0; 4 to 255
D: = Data block
F: = Flag area
XX: = Indirect block initialization
(the block parameters are
stored in a data block)
First word of
data block or
flag area
ANFA D KF In the case of data block: 0 to 252
In the case of flag area: 2 to 248
Number of
blocks
BLCK D KF 1 - 32
Specification of eight-byte data
blocks sent/received
Indirect assignment of FB 252 parameters
If you want to assign the FB 252 parameters indirectly, store the six block parameters in a data
block in consecutive data words. Please note the order of the parameters!
When calling FB 252 you must also specify the following:
• The value ”XX” in the parameter type
• The number of the DB (DB 4 to 255) with the block parameter assignments for the DBNR
parameter
or
the value ”C” for the DBNR parameter if the last opened DB contains the block parameter
assignments
• The number of the data word containing the first block parameter (BADR parameter) for the
ANFA parameter.
The BADR, FUNK and BLCK parameters must be assigned permissible values but the values them-
selves are insignificant in this case.
EWA 4NEB 811 6149-02
6-9

Table of Contents

Other manuals for Siemens SIMATIC S5

Preview: Equipment Manual
Equipment Manual197 pages
Preview: Operating Instructions
Operating Instructions43 pages
Preview: Instructions
Instructions40 pages

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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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