Product Description XI/ON - Eaton Automation

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XI/ON: Gateways for Modbus TCP 9 Appendix RX_CNT_ACK 0-3 The value RX_CNT_ACK is a copy of the value RX_CNT. TX_CNT has been transmitted together with the last data segment of the process input data. TX_CNT_ACK is an acknowledge for the successful transmission of the data segment with RX_CNT. TX_CNT 0-3 This value is transferred together with every data segment. The TX_CNT values are sequential: 00->01->10->11->00... (decimal: 0->1->2->3->0...) Errors in this sequence show the loss of data segments. TX_BYTE_CNT 0 - 7 Number of the valid user data in this data segment. In PROFIBUS-DP, the data segments contain a maximum number of 6 bytes of user data. 198 M001973-01, 07/2007
XI/ON: Gateways for Modbus TCP 9 Appendix 9.1.3 SSI-Modul Process input data The field input data is transferred from the connected field device to the XN-1SSI module. The process input data is the data that is transferred to the PLC from the XN-1SSI via a gateway. This is transferred in an 8 byte format as follows: 4 bytes are used for representing the data that was read from the register with the address stated at REG_RD_ADR. When necessary, 1 byte represents the register address of the read data and an acknowledgement that the read operation was successful. 1 byte can be used to transfer status messages of the SSI encoder. This byte also contains an acknowledgement that the write operation to the register was successful and indication of an active write operation. 1 byte contains the results of comparison operations with the SSI encoder value. 1 byte contains messages concerning the communication status between the XN-1SSI module and the SSI encoder, as well as other results of comparison operations. The following table describes the structure of the 8 x 8 bits of the process input data. STS (or ERR) contains non-retentive status information, i.e. the bit concerned indicates the actual status. FLAG describes a retentive flag that is set in the event of a particular event. The bit concerned retains the value until it is reset. M001973-01, 07/2007 199
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Product Description XI/ON - Eaton Automation

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