Automatic control function programming manual ladder language

3.9.3 Organisation of %S Common Word Variables
The %S variables are organised in 64 128-byte blocks independently of the common word setup.
Variables
The number of an %S variable is encoded on four hexadecimal digits. The two low digits indicate the byte number
in the station (from 0x0 to 0x7F) and the two high digits indicate the station number (from 0x0 to 0x3F). For instance,
%S21F.B represents byte 31 of station 2.
Block Variables Size
Station 0 %S0 to %S7F 128 bytes
Station 1 %S100 to %S17F 128 bytes
Stations 2-61 59 blocks of 128 bytes
Station 62 (0x3E) %S3E00 to %S3E7F 128 bytes
Station 63 (0x3F) %S3F00 to %S3F6F 112 bytes
Diagnostic %S3F70 to %S3F7F 16 bytes
Variables %S3F70.B to %S3F77.B contain the station update flags:
Variables Description
%S3F70.0 to %S3F70.7 Flags for stations 0 to 7
%S3F71.0 to %S3F71.7 Flags for stations 8 to 15
%S3F72.0 to %S3F72.7 Flags for stations 16 to 23
%S3F73.0 to %S3F73.7 Flags for stations 24 to 31
%S3F74.0 to %S3F74.7 Flags for stations 32 to 39
%S3F75.0 to %S3F75.7 Flags for stations 40 to 47
%S3F76.0 to %S3F76.7 Flags for stations 48 to 55
%S3F77.0 to %S3F77.7 Flags for stations 56 to 63
These flags are set by the system after update of the %S variables for the corresponding station. They can be reset
by the programmer to check for correct transfer operation.
Byte %S3F79B contains the number of its own station when the common word service is active.
Word %S3F7E.W is reserved for NUM product support.
REMARK If the common word service is not active, the %S variables can be used as common
unsaved variables.
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