turck BL20 - The Basic Concept

BL20 Philosophy
D301087 0308 - BL20 CANopen1-2
The Basic Concept
BL20 is a modular I/O system for use in industrial automation. It
connects the sensors and actuators in the field with the higher-level
master.
BL20 offers modules for practically all applications:
 Digital input and output modules
 Analog input and output modules
 Technology modules (counters, RS232 interface...)
A complete BL20 station counts as one station on the bus and
therefore occupies one fieldbus address in any given fieldbus struc-
ture. A BL20 station consists of a gateway, power distribution
modules and I/O modules.
The connection to the relevant fieldbus is made via the bus-specific
gateway, which is responsible for the communication between the
BL20 station and the other fieldbus stations.
The communication within the BL20 station between the gateway
and the individual BL20 modules is regulated via an internal module
bus.
Note
The gateway is the only fieldbus-dependent module on a BL20 sta-
tion. All other BL20 modules are not dependent on the fieldbus
used.