ifm
Supplementary device manual DeviceNet interface in the AS-i ControllerE (AC1318, AC1324), Target from 15
2012-02-29
Glossary of Terms
229
11 Glossary
of
Terms
A
A/B slave
AS-i slave with an A or B being appended to its
address number and which may therefore be
present twice on the
master.
Acyclic data transmission
Usually data are transmitted to one slave at a
time by the master once per cycle (= cyclic
data transmission). Data transmission only at
certain events (e.g. when the device is
switched on or when values have been
changed) is called acyclic data transmission.
Address
This is the "name" of the bus participant. All
participants need a unique address so that the
signals can be exchanged without problem.
Application software
Software specific to the application,
implemented by the machine manufacturer,
generally containing logic sequences, limits
and expressions that control the appropriate
inputs, outputs, calculations and decisions
Necessary to meet the specific (
SRP/CS)
requirements.
Programming language, safety-related
Architecture
Specific configuration of hardware and
software elements in a system.
AS-i
The AS-Interface (AS-i = Actuator Sensor
Interface) is a standard for fieldbus
communication to EN 50295 and IEC 62026-2.
It was developed for the connection of
actuators and sensors with a simple wiring to
replace the conventional parallel wiring.
An unscreened two-wire yellow flat cable (max.
500 m) serves for data transmission as well as
for voltage supply (24...30 V DC) for the
communication electronics and for participants
with a low current requirement. Loads with a
greater energy requirement additionally
receive a separate (black) flat cable for energy
supply with 24 V DC.
AS-Interface is a single master system. Up to
62 slaves can be connected per master. Each
of these slaves needs an unambiguous
address. The master cyclically polls
polling)
all projected slaves and exchanges the up to
248 input data and 186 output data with them.
More information
International Association (user association)
AS-i cycle
An AS-i cycle contains the data exchange of
up to 31 slaves plus a telegram inclusion
phase plus, if required, a telegram
management phase (
AS-i phases (status
machine)
(
→
)). In the case of the
extended addressing mode, two AS-i cycles
are required for data transfer to all A/B slaves.
AS-i phases (status machine)
Offline-Phase
Offline phase
Erkennungsphase
Detection phase
Aktivierungsphase
Activation phase
Datenaustauschphase
Data exchange phase
Managementphase
Management phase
Aufnahmephase
Inclusion phase
Aufstarten
Startup
Normalbetrieb
Normal operation
Initialisierung
Initialisation
Offline phase: No AS-i data traffic takes
place during initialisation.
Detection phase: In the detection phase,
the AS-i master first of all searches for
existing slaves - irrespective of whether
they are projected or not.
Activation phase: In this phase, the found
slaves are activated depending on the
operating mode.
