Chapter 9. Modbus/TCP Client146 PACSystems* RX7i & RX3i TCP/IP Ethernet Communications User Manual GFK-2224QCommand 3000 ExampleEstablish a channel (Channel 5) to a remote Modbus/TCP device at IP address 10.0.0.1. Return the COMMREQStatus word to %R10.Dec (Hex)Word 1 00008 (0008) Length of Channel command Data BlockWord 2 00000 (0000) Always 0 (no-wait mode request)Word 3 00008 (0008) Memory type of CRS word (%R)Word 413 00009 (0009) CRS word address minus 1 (%R10)Word 5 00000 (0000) ReservedWord 6 00000 (0000) ReservedWord 7 03000 (0BB8) Open Modbus/TCP Client ConnectionWord 8 00005 (0005) Channel number (5)Word 9 00001 (0001) Remote Device Address TypeWord 10 00004 (0004) Length of Remote Device AddressWord 11 00010 (0010) Numeric value of 1st OctetWord 12 00000 (0000) Numeric value of 2 nd OctetWord 13 00000 (0000) Numeric value of 3 rd OctetWord 14 00001 (0001) Numeric value of 4 th Octet(Word 7) Channel Command Number: Word 7 is the command id for an Open Modbus/TCP Client ConnectionCOMMREQ. If successful a TCP connection with the specified device is allocated.(Word 8) Channel Number: Word 8 specifies the channel number to allocate for the Modbus/TCP Clientconnection. Channels 1-32 can be used for Client communications.(Word 9) Address Type: Word 9 specifies the type of IP Address specified for the remote device. A value of one(1) is required in this word.(Word 10) Length of IP Address: Word 10 specifies the length of the IP Address. A value of four (4) is required inthis word.(Word 11) IP Address 1 st Octet: Word 10 specifies the value of the first octet of the IP Address.(Word 12) IP Address 2nd Octet: Word 11 specifies the value of the second octet of the IP Address.(Word 13) IP Address 3rd Octet: Word 12 specifies the value of the third octet of the IP Address.(Word 14) IP Address 4th Octet: Word 13 specifies the value of the fourth octet of the IP Address.
