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253
Communications Mechanism
Section 8-1
Polling Node
Each Controller Link Network always has a Unit that controls communications
within the network. This Unit is called the “polling node.” Normally, the node
that has the smallest node address in the network is the polling node (see
note). All Units at nodes other than the polling node are called “polled nodes”
(or polled units). The polling node controls the token, checks the network, and
performs other relevant tasks. Should the polling node break down, the node
with the next smallest node address is automatically selected as the polling
node to prevent the entire network from shutting down.
Note
The node with the smallest node address is not always the polling node,
depending on the Unit start-up sequence, models, settings, and Unit status.
When the polling node breaks down, the next polling node is temporarily dis-
connected from the network, reconstructs the network, and then reconnects
to the network. Polling nodes remain connected to the network.
8-1-2
Setting the Polling and Polled Nodes
Use the Programming Device for the PLC to set Units as polling node or
polled node in the DM Parameter Area.
CS/CJ-series Controller Link Units
C200HX/HG/HE Controller Link Units
CVM1 and CV-series Controller Link Units
CQM1H-series Controller Link Units
Check
Token circulation
cycle
Polling cycle
Communications cycle time
Check
Polling cycle
Token circulation
cycle
Communications cycle time
0
0 0 0 0 0 0 0 0 0 – –
0 0 0 –
15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
0
DM 30000 + 100
×
N
N: Unit number
–: Other settings
Polling node/polled node bit
0: Polling node
1: Polled node
Operating level 0
Polling node/polled node bit
0: Polling node
1: Polled node
–: Other settings
0
– 0 – 0 0 0 0 0 0 – – 0 0 0 0
15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
0
DM 6400
DM 6420
Operating level 1
0
0 0 0 0 0 0 0
15 14 13 12 11 10 9
8
0 0 – –
0 0 0 –
7
6
5
4
3
2
1
0
DM 2000 + 100
×
N
N: Unit number
–: Other settings
Polling node/polled node bit
0: Polling node
1: Polled node
Polling node/polled node bit
0: Polling node
1: Polled node
–: Other settings
0
– 0 – 0 0 0 0 0 0 – – 0 0 0
15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
0
DM 6400
0
Summary of Contents for C200HW-CLK21
Page 3: ...iv ...
Page 9: ...x ...
Page 12: ...xiii TABLE OF CONTENTS Index 367 Revision History 373 ...
Page 13: ...xiv ...
Page 19: ...xx ...
Page 57: ...32 Application Precautions Section 1 5 Example CX Programmer Response Timeout Setting ...
Page 69: ...44 Message Service Procedure Section 2 2 ...
Page 111: ...86 Constructing Networks with Repeater Units Section 3 4 ...
Page 154: ...129 Setting Data Links Section 5 2 Device Information Setting Data Link Tables ...
Page 261: ...236 Response Codes Section 6 7 ...
Page 297: ...272 Message Delay Times Section 8 4 ...
Page 353: ...328 Handling Precautions Section 9 6 ...
Page 364: ...339 Changing the Data Link Tables with Active Data Links Section 10 2 ...
Page 365: ...340 Changing the Data Link Tables with Active Data Links Section 10 2 ...
Page 369: ...344 Standard Models Appendix A ...
Page 391: ...366 Using the Relay Terminal Block Appendix C ...
Page 397: ...372 Index ...
Page 401: ...376 Revision History ...