Using the RESET Button
Pressing the RESET button resets the processor and reboots the system.
Figure 18. RESET Button Locations
SYSTEM
12-2
4
V
C
V
ISO
5-24 V
1
C
ISO
V
ISO
1. RESET Button
(RT only) Troubleshooting Network Connectivity
Use the RESET button to troubleshoot network connectivity.
1.
Hold the RESET button for 5 seconds, and then release it to boot the IC-3121 into safe
mode.
2.
After booting the controller into safe mode, hold the RESET button again for 5 seconds to
enable IP reset, which resets the network adapter to its default configuration.
Safe Mode
When you boot the IC-3121 into safe mode, it launches only the services necessary for
updating its configuration and installing software. To resume normal operations, press the
RESET button for less than 5 seconds.
IP Reset
Use IP reset to reset the TCP/IP settings when moving the system from one subnet to another
or when the current TCP/IP settings are invalid.
When the IC-3121 is in the IP reset state, the IP address of the network port resets to DHCP or
a link-local address. You can then set up a new network configuration for the IC-3121 from a
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IC-3121 User Manual
