User`s manual

Watlow EZ-ZONE™ RUI/Gateway • 20 • Chapter 5 Networking with a Gateway
Saving Settings to Non-volatile
Memory
When controller settings are entered from the con-
troller front panel or a remote user interface (RUI)
changes are always saved to non-volatile memory (EE-
PROM). 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, via the gateway
or a computer through a network connection, the EE-
PROM could, over time, wear out.
By default, settings made over Standard Bus (Com
instance 1) via the gateway or front panel of the RUI
are saved to EEPROM. Once changed, a write to EE-
PROM will occur. No further writes to EEPROM will
occur until the data changes again. If it is desired to
inhibit writes to the EEPROM using a CIP network
set class 150, instance 1, and attribute 8 to 59. If using
Modbus set register 2494 to 59.
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 EZ-ZONE PM
and ST firmware revision 2 and above.