Modicon Quantum 140DDI35310 Input Module

Modicon Quantum 140DDI35310 Input Module Description:

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Modicon Quantum 140DDI35310 Input Module

Modicon Quantum 140DDI35310 Input Module

Modicon Quantum 140DDI35310 Input Module

For example, the value 63 hex is sent as one 8–bit byte in RTU mode (01100011). The same value sent in ASCII mode requires two bytes, for ASCII ‘6’ (0110110) and ‘3’ (0110011). The ‘Byte Count’ field counts this data as one 8–bit item, regardless of the character framing method (ASCII or RTU). How to Use the Byte Count Field: When you construct responses in buffers, use a Byte Count value that equals the count of 8–bit bytes in your message data. The value is exclusive of all other field contents, including the Byte Count field. Figure 8 shows how the byte count field is implemented in a typical response.

Field Contents on Modbus Plus Modbus messages sent on Modbus Plus networks are imbedded into the Logical Link Control (LLC) level frame. Modbus message fields consist of 8–bit bytes, similar to those used with RTU framing. The Slave Address field is converted to a Modbus Plus routing path by the sending device. The CRC field is not sent in the Modbus message, because it would be redundant to the CRC check performed at the High–level Data Link Control (HDLC) level. The rest of the message remains as in the standard serial format. The application software (e.g., MSTR blocks in controllers, or Modcom III in hosts) handles the framing of the message into a network packet. Figure 9 shows how a Read Holding Registers query would be imbedded into a frame for Modbus Plus transmission.