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Device manual AS-i M4 Gateway Profibus DPV1 (AC1375, AC1376)
2012-02-23
Glossary of Terms
508
Data exchange phase: The AS-i master
carries out cyclical data exchange with the
activated slaves.
Management phase: At the end of a cycle
the AS-i master goes into the management
phase, during which the master can send a
command to a specific slave (if requested).
Inclusion phase: After this, the AS-i master
goes into the inclusion phase, during which
it sends a command to a free slave
address to detect new slaves.
ASIsafe
The name for Safety at Work used by
Siemens.
B
Baud
Baud, abbrev.: Bd = unit for the data
transmission speed. Do not confuse baud with
"bits per second" (bps, bits/s). Baud indicates
the number of changes of state (steps, cycles)
per second over a transmission length. But it is
not defined how many bits per step are
transmitted. The name baud can be traced
back to the French inventor J. M. Baudot
whose code was used for telex machines.
1 MBd = 1024 x 1024 Bd = 1 048 576 Bd
Burst errors
Burst errors are errors occurring depending on
others. The class indicates the maximum
permissible number of burst errors:
Class 1 = high protection,
Class 2 = lower protection etc.
Bus
Serial data transmission of several participants
on the same cable.
C
CCDI
CCDI =
C
TT
C
onfiguration
D
ata
I
mage =
current CTT configuration
Configuration of 7.4 and 7.5 slaves currently
determined by the AS-i master:
- Manufacturer ID,
- Vendor ID,
- Device ID,
- Device Group ID.
CDI
CDI =
C
onfiguration
D
ata
I
mage = current AS-i
configuration
The configuration of the connected AS-i slaves
determined by the AS-i master:
LDS and AS-i profiles (IO, ID, ID1, ID2)
CoDeSys
CoDeSys
®
is a registered trademark of 3S –
Smart Software Solutions GmbH, Germany.
"CoDeSys for Automation Alliance" associates
companies of the automation industry whose
hardware devices are all programmed with the
widely used IEC 61131-3 development tool
CoDeSys
®
.
Homepage
ControllerE
Master in the AS-i bus system of the
generation E.
CTT
e.g. CTT2 = Combined Transaction Type 2
Combined transaction – Use of analogue
channels in the gateway depending on the
slave profile (
→
)
Cycle time
This is the time for one cycle. The following
happens:
PLC cycle: The PLC program performs
one complete run.
AS-i cycle: all AS-i slaves are updated
(5...10 ms).
The cycle time mainly depends on the AS-i
slaves involved in the data exchange.
Message errors and management phase
may extend the cycle time (
no constant
cycle time).
Cyclic data transmission
Data are transmitted to one slave at a time by
the master once per cycle.
