Entering Maintenance Mode And Performing Maintenance - GE VersaMax GFK-2721A Manual

5

Entering Maintenance Mode and Performing Maintenance

1. In Normal mode, press and hold the MAINT pushbutton for at least 3 seconds.
2. When the MAINT LED begins to blink, indicating the PNS has transitioned to
Maintenance mode, release the pushbutton.
3. If modules or carriers to the right of a Booster Power Supply need to be changed,
remove power from the Booster Power Supply.
4. Add, remove or replace carriers and modules as needed. If necessary, the PNS can be
disconnected from the rest of the VersaMax stick.
When the PNS is in Maintenance Mode:

The MAINT LED blinks amber.

Power to all backplane modules to the left of any Booster Power Supply is disabled.

All backplane interface signals are tri-stated.

All established PROFINET ARs are terminated.

All requests to establish an AR are rejected.

All modules are sent to their module default state. This is different from their
configured defaults. For example, if a discrete output module is configured for
non-zero defaults, entering Maintenance mode sets the outputs to zero, not their
non-zero configured defaults. This is true for modules to the right of booster
supplies as well as modules powered from the PNS power supplies.

The PNS keeps its Ethernet switch functional, and (if so configured) continues to
support the Media Redundancy protocol.
5-2
VersaMax PROFINET Scanner Manual – December 2013
GFK-2721A