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Rockwell Automation Publication 442G-UM002A-EN-P - December 2016
Chapter 3
Use the Multifunctional Access Box in an Integrated Safety Controller-based System
When the IP Address of the Module Is Unknown
1. Set DHCP DIP Switch (refer to
Figure 3 on page 43
) to the ON position.
2. Power cycle the module.
3. Use a DHCP server to set the IP address as described in section “Setting the
Network IP Address.”
4. Disable DHCP.
5. Return the DHCP DIP Switch to the OFF position.
Duplicate IP Address
Detection and Resolution
The module verifies that its IP address does not match any other module IP
address on the network when you perform either of these tasks:
• Connect the module to a EtherNet/IP network.
• Change the IP address on the module.
If the IP address matches that of another module on the network, the
EtherNet/IP port on the module transitions to conflict mode. In conflict
mode, these conditions exist:
• Module (MOD) status indicator flashes red.
• Network (NET) status indicator is solid red.
This table describes how to resolve duplicate IP addresses.
IMPORTANT
If you do not select Disable BOOTP/DHCP, then on a power cycle the module
clears the current IP configuration and begins sending DHCP requests again.
IMPORTANT
If you do not select Disable BOOTP/DHCP, then on a power cycle the module
clears the current IP configuration and begins sending DHCP requests again.
Duplicate IP Address Detection Conditions
Resolution Process
• Both modules support duplicate IP address detection.
• Second module is added to the network after the first module is operating on the
network.
1. The module that began operation first uses the IP address and continues to operate
without interruption.
2. The module that begins operation second detects the duplication and enters Conflict
mode.
3. Assign a new IP address to the module that is in Conflict mode.
• Both modules support duplicate IP address detection
• Both modules were powered up at approximately the same time.
Both EtherNet/IP modules enter Conflict mode.
To resolve this conflict, follow these steps:
1. Assign a new IP address to one of the modules.
2. Cycle power to the other module.
One module supports duplicate IP address detection and a second module does not.
1. Regardless of which module obtained the IP address first, the module that does not
support IP address detection uses the IP address and continues to operate without
interruption.
2. The module that supports duplicate IP address detection detects the duplication and
enters Conflict mode.
3. Assign a new IP address to the module that is in conflict mode.
