Interbus Page: Diagnostics; Figure 2-3: Diagnostics Interbus - Addi-Data APCI-8001 Option Manual

38 O
PTIONS MANUAL
All available Interbus devices receive a consecutive number (Device column). This number corresponds to
the actual position in the bus structure. The BusNo.SegNo. column specifies the bus segment to which the
respective device belongs, and which consecutive number it has in this segment. The PD-Bits column
(LengthCode) displays the address space required by the respective device in the host. The Device-Id
column is used to describe the device function. Usually, the ID codes are expressed in decimal form on the
Interbus module and in hexadecimal form for the RT modules. The Name and Description columns describe
the respective module in plain text.
For SAP and PCAP programming, valuable information is also contained in this screen output. This includes
all mode definitions, which are used to help activate the respective field bus device. The AT specifier column
contains the mode definitions for declaring system variables for SAP programming and also includes the
necessary information for object access using PCAP programming. In SAP programming language, access
to the E/A level is regulated according to the IEC1131 programming language, using the keyword AT [G3
Universal Object Interface / section 2.2.]
The Access type column can be used to determine how the respective system variable can be accessed, i.e.
read, write or both. The Length column shows how many bits can be used in the respective SAP variable.
Note: For the above-mentioned bus structure, there is an SAP demo programme in which the flexible and
simple Interbus communication is demonstrated.
2.2.3.3

Interbus page: Diagnostics

On the "Diagnostics" page, quasi-statistic Interbus errors, as shown in the following screenshot, are
displayed graphically in tree form.

Figure 2-3: Diagnostics Interbus

In order to activate this screen, the rwmos.elf operating system must already be launched on the board
(online mode, RwMos running)