Rockwell Automation 1797-Series ControlNet Ex Media Plannng Installation Manual User Manual
Page 34
Publication CNET-IN003A-EN-P - January 2006
2-12 Plan a ControlNet Ex Media System
•
Avoid connecting a single node’s redundant trunk cable
connections on different segments; this will cause erratic
operation.
A node supporting redundant trunk cable connections will function
even if trunk cable A is connected to the B connector on the node and
vice-versa. This makes cable fault indications (on the hardware or in
software) difficult to interpret and makes locating a bad cable segment
very difficult.
1
.
.
.
.
1
2
4
3
+V -V +V -V
Q UALITY
B
-
A
Allen-Bradley
1797 - RPA
ControlNet E
x
REPEATER ADAPTER
Comm
Status
Module
Status
PWR
.
.
.
Recv
Xmit
Recv
Xmit
Chan 2
Chan 1
1797 - RPFM
Q UALI TY
B
-
A
Allen-Bradley
ControlNet E
x
FIBER MODULE
MEDIUM RANGE
.
1
.
.
.
.
1
2
4
3
+V -V +V -V
Q UALITY
B
-
A
Allen-Bradley
1797 - RPA
ControlNet E
x
REPEATER ADAPTER
Comm
Status
Module
Status
PWR
.
.
.
Recv
Xmit
Recv
Xmit
Chan 2
Chan 1
1797 - RPFM
Q UALI TY
B
-
A
Allen-Bradley
ControlNet E
x
FIBER MODULE
MEDIUM RANGE
.
1
.
.
.
.
1
2
4
3
+V -V +V -V
Q UALITY
B
-
A
Allen-Bradley
1797 - RPA
ControlNet E
x
REPEATER ADAPTER
Comm
Status
Module
Status
PWR
.
.
.
Recv
Xmit
Recv
Xmit
Chan 2
Chan 1
1797 - RPFM
Q UALI TY
B
-
A
Allen-Bradley
ControlNet E
x
FIBER MODULE
MEDIUM RANGE
.
1
.
.
.
.
1
2
4
3
+V -V +V -V
Q UALITY
B
-
A
Allen-Bradley
1797 - RPA
ControlNet E
x
REPEATER ADAPTER
Comm
Status
Module
Status
PWR
.
.
.
Recv
Xmit
Recv
Xmit
Chan 2
Chan 1
1797 - RPFM
Q UALI TY
B
-
A
Allen-Bradley
ControlNet E
x
FIBER MODULE
MEDIUM RANGE
.
Segment 1
Segment 2
1797 Node
1786 Node
41348
1797 Fiber
Repeater Hubs
Hazardous Area
Safe Area
1786 Fiber
Repeater Hubs
ATTENTION
Never connect parts of a ControlNet cable system to
those of a ControlNet Ex cable system. The 1786
fiber repeater hub and 1797 fiber repeater hub are
used to isolate the two sections of a ControlNet
network.
ATTENTION
ControlNet Ex products cannot be used in an
intrinsically-safe environment after they have been
exposed to non-intrinsically-safe signals.