AH500 Programming Manual 6.22.2 Explanation of Ethernet Instructions Symbol: S 1 ： Socket mode Word S 2 ： Socket number Word S 3 ： Start mode Word 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 HWCONFIG of ISPSoft or using the instruction MOV to transfer the data related to the sockets to the corresponding special data registers. Explanation: 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. 4. Users can set the sockets which uses the TCP protocol to execute the data exchange.
The values in all registers can be altered except that the transmitted data counter and the received data counter are read-only counters. 6-502 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 AH500 AH500 -