Cable Disconnection Examples - Omron SYSMAC CS1W-CLK13 Operation Manual

Locating and Correcting Cable Disconnections

10-5-2 Cable Disconnection Examples

Ring Status Information Stored in Each Node
274
Bit
6 Disconnected node
information #2
5 to 0
Note The contents of disconnected node information #1 and #2 may be reversed
depending on network conditions.
The cables connecting the nodes in an Optical Ring System have two optical
fibers which provide communications in both directions. It is possible for just
one of the optical fibers to become disconnected.
Example 1: One Optical Fiber Disconnected
The following example shows a network in which just the downlink optical fiber
(the uplink fiber for node 4) is broken between nodes 3 and 4.
Node 1
SL1
The following tables show the ring status for each node in the preceding
example.
Ring Status of Node 4
Bit
15 Network Disconnection Flag
(0: Normal; 1: Disconnection detected)
14 Disconnected node
information #1
13 to 8
7 Local Node Disconnection Flag
(0: Normal; 1: Disconnection detected)
6 Disconnected node
information #2
5 to 0
Note When only one node's disconnected node information is stored, the data is
stored in bits 8 to 14 (disconnected node information #1).
Function
Disconnected Interface Flag
0: SL1/normal; 1: SL2
Node address of disconnected node
Node 2
SL2 SL1 SL2
SL2 SL1
Node 6
Function
Disconnected Interface Flag
0: SL1/normal; 1: SL2
Node address of disconnected node
Disconnected Interface Flag
0: SL1/normal; 1: SL2
Node address of disconnected node
Section 10-5
Node 3 Node 4
SL1 SL2 SL1
SL2 SL1
Node 5
Value
0
04 Hex
SL2
Value
1
0
04 Hex
1
0
00 Hex