Watlow Electric Gateway & DeviceNet manual Ez-Zoneeeprom

RUI/Gateway & DeviceNetTM

Configuration & Ladder Logic Example

Using an Allen-Bradley CompactLogix PLC

22.Notice too, the slot number, in this case “1”. This is the physical slot in which the scanner resides. After the scanner is configured two tags will be automatically generated reflecting the existence of the scanner in slot 1 of the I/O structure. These tags will be used to move the implicit input and output assemblies (more on this to follow) to and from the RUI/Gateway and then ultimately to the destination EZ-ZONE®PM controls that exist on Standard Bus.

EZ-ZONE®EEPROM

23.Before we get started with the programming examples it is important to note that the EZ- ZONE® family of controls has an on-board EEPROM to back up user settings in the event of a power loss. By default, the non-volatile save parameter is enabled, therefore changes made

over the network as well as any changes made from the RUI are saved to the EEPROM. If the implicit output (PLC to EZ-ZONE®Control) assembly is in use, where information is exchanged implicitly (continuously after the connection is established) the rate at which writes to EEPROM occur could be very fast. With this being said, it should be considered carefully as to whether or not this parameter should remain enabled. To avoid premature EEPROM failure (~1,000,000 writes) it is recommended that the user disable the non-volatile write parameter in the destination nodes residing on the Standard Bus side of the RUI/Gateway. An example will follow showing how to read and write to this parameter.

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