Specifications

11
DeviceNet Cable Layout
The DeviceNet trunk line is routed through the vertical wireway of the MCC.
Trunk lines are routed behind barriers to isolate the cable from the unit space and
wireways to help prevent accidental damage.
Up to six DeviceNet ports can be provided in the control and network wireway.
Each DeviceNet component in an MCC unit is connected to the network through
a port located in the wireway. Adding or removing units from the network does
not interrupt the other units operating in the system.
DeviceNet System Performance
The DeviceNet system in the MCC is designed to operate at 500 kbaud to
maximize performance. To achieve best performance, all MCCs are engineered
for a 250 kbaud minimum communication rate.
The DeviceNet system in the MCC is qualified to communicate and perform under normal and adverse electrical
environments (for example, contactor electrical operation, contactor jogging duty and unit short circuit fault).
The DeviceNet system has the following capabilities:
• Automatic Device Replacement (ADR) which automatically downloads the parameter settings of a failed device to
its replacement.
• On-line Scanlist Changes at Run, allows network modifications to be performed on a DeviceNet system that is
running.
• By choosing the appropriate scan mode (Polled, Change of Stat (COS), Strobe and Cyclic) for different data,
DeviceNet systems can achieve better throughput performance than networks with much higher communication
rates.
• Allow the control system to access every parameter in the device, not just a few registers, by transmitting and
receiving data via I/O explicit messaging.
DeviceNet
Trunk Line
DeviceNet
Ports
DeviceNet
Ports
Inside look at DeviceNet cable routing in
one CENTERLINE 2100 MCC section