User`s manual

Watlow EZ-ZONE™ Communications • 39 • Chapter 3 EtherNet/IP
When controller settings are entered from the controller front panel or a remote user interface (RUI)
changes are always saved to non-volatile memory (EEPROM). If the controller loses power or is switched off
its settings will be restored when power is reapplied.
The EEPROM will wear out after about 1,000,000 writes, which should not be a problem with changes
made from the panel or RUI. However if the controller is receiving instructions from a PLC or a computer
through a network connection, the EEPROM could, over time, wear out.
By default, settings made through the network are not saved to nonvolatile memory (59). However, every
time a setting is changed through the front panel or RUI, all of the controller settings are saved to EEPROM,
regardless of the setting of nonvolatile memory save. This parameter can only be changed via the network
protocol (i.e., Modbus RTU, Modbus TCP, or EtherNet/IP) and will always be saved to EEPROM.
Non-volatile Save
Modbus Addr: 2494
EtherNet/IP & DeviceNet
Class: 150
Instance: 1
Attribute: 8
Enumeration: yes = 106, no = 59
Note:
Disabling EEPROM writes is available with PM firmware revision 2 and above.
Saving Settings to Non-volatile Memory