VIPA CPU 21 Series, Manual

Page: 122 / 394

Chapter 4 Deployment of the CPU 21x-2BT10 with TCP/IP Manual VIPA CPU 21x
4-42 HB103E - Rev. 05/45
Coupling to other systems
The operating mode FETCH/WRITE supported at TCP res. ISO-on-TCP
can be used for accesses of partner devices to the PLC system memory.
To be able to use this access also for example for implementation in PC
applications you have to know the telegram structure for orders. The
specific headers for request and acknowledgement telegrams have per
default a length of 16Byte and are described at the following pages.
The organization format is the abbreviated description of a data source or a
data destination in a PLC environment. The available ORG formats are
listed in the following table.
The ERW-identifier is used for the addressing of data blocks. In this case
the data block number is entered into this identifier. The start address and
quantity provide the address for the memory area and they are stored in
HIGH-/LOW- format (Motorola-formatted addresses)
Description Type Range
ORG identifier BYTE 1..x
ERW identifier BYTE 1..255
Start address HILOWORD 0..y
Length HILOWORD 1..z
The following table contains a list of available ORG-formats. The "length"
must not be entered as -1 (FFFFh).
ORG identifier 01h-04h
CPU area DB MB EB AB
ORG identifier 01h 02h 03h 04h
Description Source/destination
data from/into data
Block in main
memory.
Source/destination
data from/into flag
memory area Source/destination
data from/into process
image of the inputs
(PII). Source/destination
data from/into process
image of the outputs
(PIO).
ERW identifier
(DBNO)
DB, from where the
source data is
retrieved or to where
the destination data is
transferred.
irrelevant irrelevant irrelevant
Start address
significance
DBB-No., from where
the data is retrieved or
where the data is
saved.
MB-No., from where
the data is retrieved or
where the data is
saved.
IB-No., from where the
data is retrieved or
where the data is
saved.
QB-No., from where
the data is retrieved or
where the data is
saved.
Length
significance
Length of the
source/destination
data block in words
Length of the
source/destination
data block in bytes
Length of the
source/destination
data block in bytes
Length of the
source/destination
data block in bytes
Outline
ORG format