POWERLINK Information
3.10.1.8 States and Communication object relation
EPL controlled network traffic
SoC
PReq
PDO reception
PRes receive
PRes transmit
PDO transmission
SoA
IdentRequest
StatusRequest
NMTRequestInvite
UnspecifiedInvite
Reception of asynchronous frames
SDO reception
NMT Command
other protocols
Transmission, assigned by SoA
SDO transmission
NMTRequest transmission
IdentResponse
StatusResponse
other protocols
Network traffic not controlled by EPL
Legacy Ethernet reception
UDP/IP reception
SDO reception (UDP/IP)
EPL-ASnd reception
SDO reception (EPL-ASnd)
Legacy Ethernet transmission
UDP/IP, autonomously sent
SDO transmission (UDP/IP)
EPL-ASnd, autonomously sent
SDO transmission (EPL-ASnd)
Table 2: States and communication objects
R
frame accepted
R/S
frame accepted, triggers state transition
T
frame transmitted
(T)
dummy PRes only
x
frame data interpreted respectively transmitted
1
(x)
frame data interpreted
2
(x)
data invalidated by resetting the RD flag
3
(x)
only selected NMT commands accepted, state transition is performed,
reception requires previous loss of SoA
4
x
state transition is performed
5
(x
)
depends on protocol support
-
no frame handling
TR-Electronic GmbH 2008, All Rights Reserved
Page 124 of 187
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TR - ECE - BA - DGB - 0071 - 05
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R
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(T)
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(x)
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R
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T
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Printed in the Federal Republic of Germany
R
-
R/S
R
-
R/S
x
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R
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R/S
T
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x
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R
R
R/S
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x
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R
R
R
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4
4
3
x
x
(x)
x
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T
T
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x
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x
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x
x
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x
x
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x
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R
5
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(x
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5
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(x
)
5
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(x
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5
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(x
)
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T
5
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(x
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5
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(x
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5
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(x
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5
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(x
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06/26/2017