Chapter 6 Applied Instructions 6.22.2 Explanation of Ethernet Instructions Symbol: S 1 ： Socket mode Word S 2 ： Socket number Word S 3 ： Start mode Word Explanation: 1. S 1 is 1 if users want to open the TCP socket, and S 1 is 0 if users want to open the UDP socket. S 2 is the socket number. The AH500 series PLC as the client sends the TCP connection request to the server if S 3 is 1, and the AH500 series PLC as the sever waits for the TCP connection request from the client if S 3 is 0. If users want to start the UDP connection, S 3 can be 0 or 1. 2. The operand S 1 should be either 0 or 1; the operand S 2 should be within the range between 1 and 8; the operand S 3 should be either 0 or 1.
3. Before using the instruction, users have to accomplish the following setting in ISPSoft. PLC Parameter Setting → Ethernet-Basic → Setting the IP addres and the netmask address PLC Parameter Setting → Ethernet-Advance → Socket → Enable Socket Function PLC Parameter Setting → Ethernet-Advance → Socket → TCP/UDP Socket Connection → Setting the sockets which are used, or using the instruction MOV to transfer the data related to the sockets to the corresponding special data registers 4. Users can set the sockets which uses the TCP protocol to execute the data exchange in SR1118~SR1221.
The values in all registers can be altered except that the transmitted data counter and the received data counter are read-only counters.
6-506 API Instruction code Operand Function 2200 SOPEN P S , S , S 1 2 3 Opening the socket Device X Y M S T C HC D L SM SR E PR K 16# “$” DF S 1 S 2 S 3 Pulse instruction 16-bit instruction (7 steps) 32-bit instruction AH AH - It Socke t r 1 2 3 4 5 6 7 8 Numbe em Local communication port SR1118 SR1131 SR1144 SR1157 SR1170 SR1183 SR1196 SR1209 Remote IP address (high word) SR1119 SR1132 SR1145 SR1158 SR1171 SR1184 SR1197 SR1210 Remote IP address (low word) SR1120 SR1133 SR1146 SR1159 SR1172 SR1185 SR1198 SR1211 Remote communication SR1121 SR1134 SR1147 SR1160 SR1173 SR1186 SR1199 SR1212