Watlow Electric user manual RUI/Gateway & Modbus TCP Configuration & Programming Example

RUI/Gateway & Modbus® TCP

Configuration & Programming Example

Using KEPServerEX 4.0

34.To better understand the following discussion and examples download and read the section entitled “User Programmable Memory Blocks” found in the EZ-ZONE®PM Communications user manual.

When using the RUI/Gateway equipped with Modbus® TCP or Modbus® RTU and while communicating with EZ-ZONE®*PM controls a block of 40 pointers or 80 words has been created to serve as the “Assembly Definition Addresses” and another group of 40 elements or 80 words has been defined as the “Assembly Working Addresses”. The Assembly Definition Addresses are user configurable. Once configured with the Modbus® registers of choice, the corresponding Assembly Working Addresses assume that particular parameter as programmed, and will then reflect that parameters actual value. What this means then is that the user can configure a contiguous block of 40 elements or 80 words to any available parameter of their liking. It is recommended that when doing this configuration that the parameters data type be considered. It is much easier to set up a contiguous block of words of the same data type.

Note:

If the user sets any of the EZ-ZONE®PM controls back to factory defaults this assembly for that control will set to the factory defaults as well.

*The EZ-ZONE®ST does not support programmable memory blocks. However, any ST parameter that is available over Modbus® can be accessed in a similar manner as was described in step 29.

35.In step 24 we defined the maximum number of words that can be read as 32. The maximum number of words Modbus® allows to be read at one time is 120 or 240 bytes, so all 80 words could be read and or written to if so desired. Due to this previous entry (step 24) in order to read the low order 40 words there were two read tags configured, 20 words each defining them as “Low order Assembly 1 & Low order assembly2”. Likewise, the same was done for the upper 40 words where they are defined as “High order Assembly 1 & High order Assembly2”. The screen shot below was duplicated 3 more times simply changing the names and addresses to create the tags mentioned above.

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© 2008 Watlow Electric Mfg Co	16	FM 4/08