RTA 490NBX - Appendix B: I;O Messaging - Configuration (Rev 7.03 or Later); Input; Output Assembly Byte Breakdown

Appendix B: I/O Messaging - Configuration (Rev 7.03 or Later)
In order to enable I/O Messaging, under the PLC Type dropdown select I/O Scanner on the PLC
Configuration page. Once you enable I/O Messaging, the Tag Name and Data Type in the ASCII to PLC
and PLC to ASCII direction will not be used.
1. Set up the 490NBX as a Generic Ethernet Module into the Ethernet module I/O tree
2. Set the Data Format to “Data SINT”
3. Input Assembly: 100 (0x64) - Input Size: 416 Bytes
4. Output Assembly: 112 (0x70) - Output Size: 416 Bytes
5. Configuration Assembly: Any number (unused) - Configuration Size: 0 bytes
Input / Output Assembly Byte Breakdown
Input Assembly (ASCII to PLC) Port 0: Input Assembly (ASCII to PLC) Port 1:
- Bytes 0-1: Output Handshake - Bytes 208-209: Output Handshake
- Bytes 2-3: Input Sequence Number - Bytes 210-211: Input Sequence Number
- Bytes 4-7: Input Length - Bytes 212-215: Input Length
- Bytes 8-207: Input Data (0-200 bytes) - Bytes 216-415: Input Data (0-200 bytes)
Output Assembly (PLC to ASCII) Port 0: Output Assembly (PLC to ASCII) Port 1:
- Bytes 0-1: Input Handshake - Bytes 208-209: Input Handshake
- Bytes 2-3: Output Sequence Number - Bytes 210-211: Output Sequence Number
- Bytes 4-7: Output Length - Bytes 212-215: Output Length
- Bytes 8-207: Output Data (0-200 bytes) - Bytes 216-415: Output Data (0-200 bytes)
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