VIPA System 200V IM Series, Руководство пользователя

Страница: 139 / 348

Manual VIPA System 200V
Chapter 4 Interbus
HB97E - IM - Rev. 06/29 4-3
Basics
Interbus is a pure master/slave system that has very few protocol
overheads. For this reason it is well suited for applications on the
sensor/actuator level. Interbus was developed by PHOENIX CONTACT,
Digital Equipment and the Technical University of Lemgo during the 80s.
The first system components became available in 1988. To this day the
communication protocol has remained virtually unchanged. It is therefore
means that it is entirely possible to connect devices of the first generation
to the most recent master interfaces (generation 4).
The widespread use of Interbus for sensor/actuator level applications may
be ascribed to the relatively simple interfacing requirements that are
supported by protocol driver chips. These reduce the number of external
components required for direct input or output interfacing to a minimum.
Interbus devices are subject to the DIN standard 19258 that defines levels
1 and 2 of the protocol amongst others.
The Interbus system is designed as a ring-type network with a central
master-slave access procedure. It has the structure of a distributed shift
register. The different registers of the devices connected to the ring are a
portion of this shift register. The master shifts the data through this shift
register. The ring structure of the network permits simultaneous
transmission and reception of data. Data may be sent in both directions on
the ring, which uses a single cable.
Every Interbus module has an ID register (identification register). This
register contains information on the type of module, the number of input
and output registers as well as status and error flags.
The Interbus coupler can be used to control the peripheral modules of the
System 200V via Interbus. In this case the bus coupler replaces the CPU.
The Interbus master reads and writes data from/to inputs and outputs
respectively. The master is the link to other systems. Every master can
control a maximum of 4096 input/output points. These may be located on
the local bus or they may be distributed amongst secondary structures
connected by means of bus couplers.
It is possible to connect remote ring systems to the main ring to provide a
structured system. These remote ring systems are connected by means of
bus terminal modules. You can also use these bus terminal modules for
long distance communications.
General
Interbus for
sensor and
actuator level
Interbus as shift
register
ID register
Interbus master