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Speed Actual: Inverter operating speed in RPM. Maps to inverter register 1301
(output frequency). Because the inverter always provides its output frequency in
units of Hz, the interface card applies a Hz-to-RPM conversion equation. The
general Hz-to-RPM conversion equation is [output frequency x 120 / number of
motor poles]. However, for simplicity the interface card always assumes that a 4-
pole motor is in use, thereby reducing the applied conversion equation to [RPM =
output frequency value x 30].
13.2.3 ControlLogix Examples: Setup
This section will demonstrate how to initially setup a ControlLogix PLC (such as a
1756-L61) coupled with a 1756-ENBT/A communication interface (adjust this
procedure according to your specific equipment). Later sections will provide specific
read/write examples using this configuration with I/O or explicit messaging.
1) Run RSLogix 5000, and create a new configuration.
2) To add a 1756-ENBT/A to your I/O configuration, first switch to offline mode.
3) Right click on the I/O Configuration node in the controller organizer view and
choose “New Module…”
4) The “Select Module” window will open.
5) Under “Communications”, select “1756-ENBT/A”, and click OK. Refer to Figure
74.
Figure 74: Adding a New Module
6) The “New Module” window will open. Refer to Figure 75.
7) Assign the Ethernet module a name (we will use “EIP”) and an IP address,
deselect “Open Module Properties”, and click OK.