Siemens SIMATIC S5 Manual page 267

Access commands for the S5-115U, S5-135U and S5-155U programmable controllers
Word consistency The following is based on the "ID" dialog box in COM ET 200:
over module
Table B-31
commands
1
ET 200 Distributed I/O System
EWA 4NEB 780 6000-02a
Word consistency over m/2 words (total length)
Length:
Format:
Module consistency
Byte P area: 0 to 127
n
n + 1
...
1
n + m
access L PW x/T PW x
m corresponds to the length in bytes you defined in the "ID" dialog box.
[m/2]
Word
P area: 128 to 255 Q area: 0 to 255
L PW x/T PW x L QW x/T QW x
B
B-27