AH500 Programming Manual Symbol: S 1 ： Unit address Word S 2 ： Function code Word S 3 ： Device address Word S ： Register involved in the reading/writing of the data Bit/Word n ： Data length Word Explanation: 1. 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 2. Setting S 1 : S 2 : Function code For example: 1 (16#01): The AH500 series PLC reads the data from several bit devices which are not discrete input devices. 2 (16#02): The AH500 series PLC reads the data from several bit devices which are discrete input devices. 3 (16#03):
The AH500 series PLC reads the data from several word devices which are not input registers. 4 (16#04): The AH500 series PLC reads the data from several word devices which are input registers. 6-520 API Instruction code Operand Function 2205 EMDRW P S , S , S , S, n 1 2 3 Reading/Writing the Modbus TCP data Device X Y M S T C HC D L SM SR E PR K 16# “$” DF S 1 S 2 S 3 S n Pulse instruction 16-bit instruction (11 steps) 32-bit instruction AH500 AH500 - Operand Description Setting range S 1 Station address The station address should be within the range between 0 and 255.
S +1 1 Remote IP address (high word) Example: The remote IP address is 172.16.144.230. S +1=16#AC10 1 S +2=16#90E6 1 S +2 1 Remote IP address (low word) S +3 1 Whether to close the connection 0: The connection is closed after the execution of the instruction is complete. 1: The connection is persistent. (The closing of the connection depends on the setting of the TCP keepalive timer.)