Specifications

Configuration of connections CP143 H1 / TCP/IP manual
5-28 Rev. 00/07
Indicator word
Specifies a data word on the PLC that contains the specifications for FETCH and WRITE
Operand DB-No. Address Type
DB 1..255 0..2040 Data module
DX 1..255 0..2040 extended data module
MW 0..252 Flag word
Tab. 5-2: Data word for the indicator word for indirect addressing
Notes on the structure of the data modules for indirect addressing are contained in the description of
the standard handler modules provided by the Siemens manuals.
Example
Indirect addressing using the SEND module
Call to the SEND-FBs
A DB X ; Open the data module x
SPA FB244 ; Call the SEND module
NAME : SEND
SSNR : KY 255,1 ; 255 is the key for indirect addressing
; 1 is interpreted as a pointer to DW 1
A-NR : KY 0,0 ; irrelevant
ANZW : MW 0 ; irrelevant
:
:
Data module
DB X
DW 1 KY 0,1
DW 2 KY 0,31
DW 3 KC MW
DW 4 KY 0,200
The left byte of parameter SSNR is used as to decide between direct and indirect addressing. If the
left byte > 0 the addressing is of the indirect type.
In this case the right byte represents the pointer to the parameter field.