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ifm
Device Manual AS-i IO-Link-Gateway (AC5225) Firmware V1.16
2017-11-20
Glossary of Terms
8
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
In general data from the
→ master are transmitted once per → cycle to one each of the → slaves
(=
→ 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.
>
Architecture
Specific configuration of hardware and/or 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.
AS-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.
Summary of Contents for AC5225
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