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10.2.12 ControlLogix Example: I/O Messaging
This section will demonstrate how to setup and use an EtherNet/IP I/O connection via vendor-specific
assembly instances 100 & 150 or 20 & 70 or 20 & 71. EtherNet/IP I/O messaging allows the inverter’s
function codes to be directly mapped into tags in the ControlLogix PLC. Once an I/O connection is
established, it is automatically synchronized at an interval defined by the Requested Packet Interval
(RPI).
1)
Switch to offline mode.
2) Right click on the 1756-ENBT/A node under the I/O Configuration in the controller organizer view
and choose “New Module…”
3)
Choose “Generic Ethernet Module” in the Select Module dialog box and click “Create”. Refer to
Figure 37.
Figure 37: Adding a New Generic Ethernet Module
4) The module properties dialog box will open (refer to Figure 38). Enter a Name which will allow
easy identification of the inverter on the network (the tags created in RSLogix 5000 will be derived
from this Name). Because all inverter data is stored as 16-bit function codes
, change the “Comm
Format” selection to “Data-INT”. Enter the IP address of the targeted interface card.
Figure 38: Interface Card Module Properties
In the “Connection Parameters” portion of the dialog box, enter the following information: