How To Apply The Poll Connection - ICP DAS USA I-7242D User Manual
Devicenet / modbus rtu gateway.
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7.2.2
How to apply the Poll Connection
Poll Command and Responses message move any amount of I/O data
between a Master and its Polled Slaves. The example explains how to apply
the Poll IO connection in the DeviceNet application.
Table 7-4 shows the Poll I/O Connection Identifier Fields.
Table 7-4 Identifier Fields of the Poll I/O connection
IDENTIFIER BITS
10
9
8
7
6
5
1
0
Destination MAC ID
1
0
Source MAC ID
1
0
Destination MAC ID
1
0
Destination MAC ID
0
1
1
1
1
Source MAC ID
Note: Slave (I-7242D): Node ID=0x09, Master: Node ID=0x0A
1. Request the use of the Predefined Master/Slave Connection set
Allociation Choice : Explicit & Polled
Master (MAC ID =0x0A)
_ Group 2 Message
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_ Destination MAC ID=0x09
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_ Message ID =6
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ID=10 001001 110. Data= 0A 4B 03 01
_ Group 2 Message
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_ Source MAC ID=0x09
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_ Message ID =3
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ID=10 001001 110. Data= 0A CB 00
I-7242D DeviceNet/Modbus RTU Gateway User's Manual, July 2006, Version 1.1
4
3
2
1
0
1
0
1
Master's I/O Poll Command/Change of State/Cyclic
Message
0
1
1
Slave's Explicit/ Unconnected Response Messages
1
1
0
Group 2 Only Unconnected Explicit Request
Messages
1
0
0
Master's Explicit Request Messages
Slave's I/O Poll Response Message
_ Frag=0. Transaction ID=0. Souce MAC ID= 0x0A
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_ Service=Allocate_Master/Slave_Connection_Set Request
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| _ Class ID=3
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| | _ Instance ID=1
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| | | _
Allocation Choice=Explicit & Polled
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_ Allocator's MAC ID=0x0A
03
0A
_ Frag=0. Transaction ID=0. Destination MAC ID= 0x0A
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_ Service=Allocate_Master/Slave_Connection_Set Response
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| _Connection Message Body Format = DeviceNet (8/8)
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I-7242D user manual
IDENTITY USAGE
Slave (MAC ID =0x09)
HEX
RANGE
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