US 9,507,661 B2Granted

Bus system having a master and a group of slaves and communication method for interchanging data in said bus system

AssigneeAS-International Association E.V.

InventorsMatthias Breuninger, Thomas Handte, Hanns Thilo Hagmeyer

Life of this patent

Estimating the term…

Loading patent…

Abstract

The invention relates to a bus system having a master and a group of slaves connected thereto via a bus and to a communication method for interchanging data between the master and slaves in such a bus system. At least one communication frequency is associated with each slave in the group. The master places transmission data at different communication frequencies onto the bus in transmission phases. Each slave in the group reads in and processes those transmission data which have been placed onto the bus by the master at a frequency corresponding to the, or a, communication frequency associated with this slave and ignores and rejects those transmission data which have been placed onto the bus by the master at a frequency corresponding to a communication frequency associated with another slave in the group, with the result that each slave in the group can be individually addressed by the master by virtue of the fact that transmission data are transmitted from the master to each of the slaves in the group at that communication frequency which has been associated with said slave.

Claims27

Dependent claims

A communication method, in particular for automation purposes, for interchanging data between a master (M) and at least one group of slaves (1a, 1b, 1c, 2a, 2b, 2c, 3a, 3b, 3c, 3d) connected in parallel to said master (M) via a bus (B, B′) in a bus system including said master (M), said slaves (1a, 1b, 1c, 2a, 2b, 2c, 3a, 3b, 3c, 3d) and said bus (B, B′), characterized by the following steps:

a) each slave of said group has at least one communication frequency (f1, f2, f3, f4, f5, f6, f7, f8) assigned thereto,
b) said master (M) goes through transmit phases during which it loads various transmit data onto said bus (B, B′) at different communication frequencies,
c) each slave of said group
reads in and processes transmit data loaded by the master (M) onto the bus (B, B′) at a frequency
which corresponds to the at least one communication frequency assigned to said slave in step a),
and ignores or discards transmit data loaded by said master (M) onto said bus (B, B′) at a frequency which does not correspond to at least one of its assigned communication frequencies, wherein
f) the master (M) goes through at least one additional transmit phase during which it loads additional transmit data onto said bus (B, B′) at at least one additional frequency (fz),
g) all slaves of said group read in and process said additional transmit data loaded by the master (M) onto said bus (B, B′) at said additional frequency (fz) in step f), such that all slaves of said group are able to be addressed y said master (M) by means of said additional transmit data transmitted at said additional frequency (fz) or said additional frequencies, even if step a) has not been carried out, or if said slaves have no communication frequency assigned, wherein
said additional transmit data contain information which as at least one communication frequency to each slave, such that step a) is executed along with the execution of steps f) and g), wherein
a1) the master (M) addresses a first slave of said group by transmitting an identifier in the additional data via said bus (B, B′) in step f),
a2) the master (M) performs at least one test communication with the first slave at different test frequencies,
a3) for each test communication, the associated signal-to-noise ratio or the associated bit error rate is determined,
a4) between all test frequencies used in step a2), which have not been assigned as communication frequency to a slave, the first slave has the test frequency assigned as communication frequency which achieved the highest signal-to-noise ratio or the lowest bit error rate in step a2,
a5) steps a1)-a4) are repeated correspondingly for the remaining slaves of said group.

11 more elements

A bus system including a master (M) and at least one group of slaves (1a, 1b, 1c, 2a, 2b, 2c, 3a, 3b, 3c, 3d) connected in parallel to said master (M) via a bus (B, B′), characterized in that

each slave of said group has or is able to have at least one communication frequency (f1, f2, f3, f4, f5, f6, f7, f8) assigned thereto, said master (M) is able to go through transmit phases during which it loads various transmit data onto said bus (B, B′) at different communication frequencies,
each slave of said group is able to read in and process transmit data loaded by the master (M) onto the bus (B, B′) at a frequency
which corresponds to the at least one communication frequency assigned to said slave,
and is configured to ignore or discard transmit data loaded by said master (M) onto said bus (B, B′) at a frequency which correspond to a communication frequency assigned to another slave of said group,
such that each slave of said group is able to be individually addressed by the master (M) by means of transmit data transferred by the master (M) to said slave via said bus (B, B′) at at least one communication frequency assigned to said slave, such that the transfer of transmit data from said master (M) to said salve of said group takes place at the at least one communication frequency assigned to said slave, wherein
said master (M) is able to go through at least one additional transmit phase during which it loads additional transmit data onto said bus (B, B′) at at least one specific additional frequency (fz), each slave of said group is able to individually read in and process said additional transmit data loaded by the master (M) onto said bus (B, B′) at said at least one additional frequency (fz), such that each slave of said group is able to be addressed by said master (M) by means of said additional transmit data transferred by said master (M) at said additional frequency (fz) or said additional frequencies, even if said slaves have no communication frequencies assigned, wherein
said master (M) is able to assign each slave of said group with at least one communication frequency by loading data as additional transmit data onto said bus (B, B′), which contain information assigning at least one communication frequency to each slave of said group, wherein
said assignment of at least one dedicated communication frequency to each slave of said group can be performed as follows:
the master (M) addresses a first slave in said group by means of an identifier included in said additional transmit data via said bus (B, B′),
the master performs at least one test communication with said first slave at different test frequencies,
a signal-to-noise ratio or a bit error rate associated with each test communication is determined,
between all test frequencies used in this process, which have not been assigned as a communication frequency to a slave, the test frequency which helped to achieve the highest signal-to-noise ratio or the lowest bit frequency is assigned to said slave,
this procedure is repeated for accordingly for the other slaves of said group.

10 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/002,139Filed 27 Feb 2012
Priority: DE 10 2011 012 7661 Mar 2011
Published: US 2014/0025854 A123 Jan 2014
Granted: 29 Nov 2016
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

G06F 11/10
Error detection or correction by redundancy in data representation, e.g. by using checking codes: adding special bits or symbols to the coded…
G05B 19/0423
Using digital processors: input/output
G06F 13/364
With centralised access control: using independent requests or grants, e.g. using separated request and grant lines
H04L 5/0007
Time-frequency: the frequencies being orthogonal, e.g. OFDM or DMT