Instruction Manual

38 Rockwell Automation Publication CNET-IN005C-EN-P - July 2014
Appendix A 1756 ControlNet Status Indicators
Interpret the OK Status Indicator
Interpret the Network Channel Status Indicators
The network channel status indicators appear in one of these states:
• Steady—The indicator is on continuously in the defined state.
• Alternating—The two indicators alternate between the two defined states
at the same time (applies to both indicators viewed together). The two
indicators are always in opposite states, out of phase.
• Flashing—The indicator alternates between the two defined states (applies
to each indicator viewed independent of the other). If both indicators
flash, they must flash together, in phase.
1756-CN2, 1756-CN2R,
1756-CN2RXT, and
1756-CN2RK ControlNet
Communication Modules
This section provides the following information about status indicators:
• To understand the OK status indicator and display messages, refer to
Table 1 on pa g e 39
.
• For information about viewing the network channel status indicators
together, refer to Ta b le 2 on pa ge 4 2
.
• For information about viewing the network channel status indicators
individually, refer to Tabl e 3 on pa ge 4 2
.
IMPORTANT
The OK status indicator reflects the module state, such as the running of a self-
test, the updating of firmware, and normal operation without an established
connection.
When you view the status indicators, always view the OK status indicator first
to determine the state of the module. This information may help you to
interpret the network channel status indicators. As a general practice, view all
status indicators together to gain a full understanding of the module’s status.
IMPORTANT
When you connect the 1756-CNB/E and 1756-CNBR/E modules to a ControlNet
network by using only the NAP, the channel A and channel B indicators are
meaningless.