Watlow Electric Gateway & DeviceNet manual Using an Allen-Bradley CompactLogix PLC

RUI/Gateway & DeviceNetTM

Configuration & Ladder Logic Example

Using an Allen-Bradley CompactLogix PLC

37.In step 30 it was suggested that the user may want to create user defined data types. Likewise, in step 31 it was also suggested that the user should create controller tags utilizing those same user defined data types. The reasoning for this may become more obvious in the

following example. Below, two copy instructions are programmed to send and receive the implicit assemblies to/from the PLC to the desired EZ-ZONE®controls.

38.As can be seen above the controller tags created for inputs from the EZ-ZONE®controls to

the PLC was defined as “GTW_Inputs” where the tag created for the outputs from PLC to EZ- ZONE® controls was named “GTW_Outputs”. The ease in programming should now be

apparent. Due to the fact that the user defined data types for both T to O and O to T assemblies where defined to correlate directly to the specific EZ-ZONE®members of choice the transfer of data between EZ-ZONE®controls and the PLC is done without a lot of effort. Below the two graphics represent both the T to O and O to T assemblies with live data.

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