AMCI NEXUS NX2A4E2, User Manual

Page: 60 / 76

E
THER
N
ET
/IP I
MPLICIT
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OMMUNICATIONS
EtherNet/IP Protocol
ADVANCED MICRO CONTROLS INC.
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4.3 Check I/O Data Formats
Verify the format and number of input and output words. The output data will appear as a 10 word integer
array. The input data will appear an a 21 word integer array. In addition to the twenty-one word array, the
input data contains a “ConnectionFaulted” status bit. This bit is a logic “1” when there is a communication
fault between the host controller and the NX2A4E2.
The NX2A4E2 will still communicate correctly with the processor if you did not change the
data size from SINT to INT. However, the data sizes above will be 20 and 42, and all of the
data in the I/O tables will be in bytes instead of words. If you wish to go back and change the
data size, right click on the NX2A4E2 in the I/O tree and select “Properties” in the pop up
menu. Then follow the instructions in section 4.2 above, starting with step 6 on page 58.
4.4 Buffer the Input Data
Data from the NX2A4E2 should be buffered once per scan using Synchronous Copy instructions. This is to
insure stable input data during the program scan. Twenty-one word integer arrays can be used for this pur-
pose.
Figure T4.6 Buffer Input Data
4.5 Configure the NX2A4E2
The device will join the EtherNet/IP network as soon as the request is made to it. The NX2A4E2 will use the
configuration data stored in its EEPROM memory to configure itself on power up. You can change this con-
figuration at anytime and store this new configuration to nonvolatile memory. Configuration is accomplished
by writing a block of data to the device that is formatted according to the specifications in the
Data Formats
reference, starting on page 17.