Siemens SIMATIC S7

Function
IP244
C79000–B8576–C861–02
5–8
3.3 Assignment of the Parameters
ADRA: KF = x Type of addressing
x = 0 Module is addressed in the extended I/O area
(O area) (S5-115U with CPU 945 (only in the
expansion unit), S5-135U and S5-155U).
x = 1 Module is addressed in normal I/O area (P area).
x = 2 Module is addressed with absolute address
(only for S5-115U).
BGAD: KF = y Module address
0 y  224 Extended I/O area (O area)
128  y  224 Normal I/O area (P area)
0  y  224 Absolute addressing
DBNR: D, KY = x,y x = data block type
x = 0 data block type = DB
x = 1 data block type = DX
(in S5-115U only valid for CPU 945)
y = Number of first data block
(DB-A / DX-A)
10  y  253 if x = 0
10  y  253 if x = 1
direct parameter assignment via the block
parameters
y = 0 Indirect parameter assignment
The input parameters are read from the currently open data block.
y  0 Direct parameter assignment
The data block specified in the parameter DB is valid. The function
block operates with the values specified for the formal operands:
ADRA (addressing type), BGAD (module address),
BEF (command) and T-NR (message number).