Extended Data Block - Cp 525 'X' Type; Description; Address Mapping; Value Conversion - Siemens SIMATIC TI505 Installation And Operation Manual

A.4 Extended Data Block — CP 525 'X' Type

Description

Address Mapping

Value Conversion

Floating-Point
Support
Reading and
Writing
S5 UniLink Adapter Installation and Operation
The S5 Extended Data Block memory, as accessed through a CP module,
refers to memory that is organized by 256 blocks of 256 words (16 bits) for a
total of 64K words of memory. Because the extended data block memory is
user configurable in the CPU, the S5 PIM assumes no knowledge of the
accessible memory ranges for each block. The TT type that maps to this type
of S5 memory is constant or K-memory (TT type 02).
NOTE: If a TIWAY request is out of range, the exception returned will be of
the form 80DD.
TI500/TI505 K-Memory Address
MS Byte = XX LS Byte = YY
15 8 7
0 – 256
Accesses S5
Block address
S5: DB = XX (hex), DW = YY in Extended Data Block 'X' memory.
TI500/TI505: XXYY (hex) in constant K-memory.
The value conversion method is identical value, meaning the binary value in
the S5 memory location corresponds exactly to the value in the TI500/TI505
memory location.
Contents of TI500/TI505 K-Memory
15 14
15 14
2 2
The TI500/TI505 IEEE floating-point TT Type F1 or 'K.' (K-dot) is also
supported for the S5 Extended Data Block Memory. The address mapping
method remains the same, with the implied length of 32 bits. The
floating-point value conversion performed by the S5 PIM is described in
Section A.1.
Reading the CP 525 X memory with the TT types 02 and F1 is supported.
Writing to the CP 525 X memory with TT types 02 and F1 is also supported.
Extended Data Block Memory
0
0 – 256
Accesses S5
Word address
256 words
maximum
Contents of S5 X Memory
3 2 1 0 15 14
3 2 1 0
2 2 2 2 2
Simatic S5 Memory Mapping
S5
Block Address
XX
Word Address YY
3
15 14 3
2 2 2
256 blocks
maximum
2 1 0
2 1 0
2 2
A-5