CTI 2572-A Installation and Operation Guide
40
Word Transfer – Unacknowledged Write
This command is designed to be used with multicast addresses, where one message can be used to
update multiple modules. Like the standard write command, this command reads the contents of a
designated area of V memory in the local PLC and writes the values in a specified area of memory in
another PLC. However, because multiple modules could receive this message, CAMP servers that
receive this command do not reply and the client does not verify that the message was received by
any server.
The following command block is used for the U
NACKNOWLEDGED WRITE
command.
Offset
Description
Hex
Decimal
0 Error
Word
0000 0
1
Command Code (Unacknowledged Write)
0201 516
2
Connection Number (19221 - 19228)
3
Source: Starting V Memory Address in the Local PLC
4
Number of Words to Transfer (1-256)
5
Destination: Starting V Memory Address in Remote PLC
6 - 9
Unused (Set to 0)
0000
0
10
IP Address of Remote Device - High 16 bits
(UDP/Multicast Only: IP Address Location bit in the Create
Socket command must be set to 1)
11
IP Address of Remote Device - Low 16 bits
(UDP Only/Multicast: IP Address Location bit in the Create
Socket command must be set to 1)
12
UDP Port Number of Remote Device
(UDP/Multicast Only: IP Address Location bit must be set
to 1)
13
Minimum Production Interval (0= Default Value = 50ms)
0000
0
14- 15
Unused (Set to 0)
0000
0
Offset 0
Error Word
- Set to 0 so that any previous error codes are cleared.
Offset 1
Command Code
- The Command Code is 516 decimal (or 0204 hexadecimal).
Offset 2
Connection Number
- You can specify any connection number that has been previously
established in a C
REATE
S
OCKET
command block.
Offset 3
Source
- The starting address of V memory which contains the values you want to transfer.
The address is 1 relative.
Offset 4
Number of Words
- This indicates the number of words you want to transfer.
Offset 5
Destination
- The starting address of V memory in the remote PLC that you want to update.
This address is 1 relative.
Offset 6-9
Unused
- Set to 0.
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