Using Socket Services by Manipulating Dedicated Control Bits | Section |
If the Remote IP Address is set to 0, a connection can be made to any remote node and the remote IP address of the node that is connected will be stored as the Remote IP Address in the Socket Service Parameter Area. If a specific remote I/O address is set, then a connection can be made only to the node with the specified address.
If the Remote TCP Port No. is set to 0, a connection can be made to any remote node regardless of the TCP port number it is using. If a specific remote TCP port number is set, then a connection can be made only to a node using the specified TCP port number.
■Remote UDP/TCP Port No.
Specify the UDP or TCP port number used by the remote device.
•This parameter is not used when making a receive request for a UDP socket. The remote UDP/TCP port number will be stored with the response data and will be written as the Remote UDP/TCP Port No. in the Socket Service Parameter Area.
•When opening a passive TCP socket, the combination of the remote IP address and the remote TCP port number can be used to affect process- ing as shown in the table for the Remote IP Address, above. If the Remote UDP/TCP Port No. is set to 0, the UDP/TCP port number of the remote device will be written as the Remote UDP/TCP Port No. in the Socket Ser- vice Parameter Area.
■Time Out Time
Set the time limit in units of 0.1 s for completion of communications from the time that the Receive Request Switch (TCP or UDP) or the TCP Passive Open Request Switch is turned ON. A response code of 0080 hexadecimal (timeout) will be stored if communications time out. If 0 is set, the requested service will not be timed.
■Number of Bytes to Send/Receive
Send the number of bytes to be sent or the number of bytes to receive. When the transfer has been completed, the actual number of bytes that have been sent or received will be written here.
■Send/Receive Data Address
Specify the address of the first word to send or the address of the first word where data is to be received. Always set the bit number to 00 hexadecimal.
Offset
+6
+7
15 | 8 | 7 | 0 |
| Area |
| Leftmost 2 digits |
| designation |
| of word address |
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| Rightmost 2 digits |
| Bit number |
| of word address |
| (always 00 Hex) |
The following specifications can be used.
| Area | Word address | Area | Word address | |
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| designation | (hexadecimal) |
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| (hexadecimal) |
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CIO, HR, |
| CIO | 0000 to 6143 | B0 | 0000 to 17FF |
and AR |
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| HR | H000 to H511 | B2 | 0000 to 01FF | |
Areas |
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| AR | A448 to A959 | B3 | 01C0 to 03BF | |
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DM Area |
| DM | D00000 to D32767 | 82 | 0000 to 7FFF |
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EM Area |
| Bank 0 | E0_00000 to E0_32767 | A0 | 0000 to 7FFF |
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| : | : | : | : |
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| Bank C | EC_00000 to EC_32767 | AC | 0000 to 7FFF |
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