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CTI 2572 Installation and Operation Guide
38
If an error is encountered writing the data to the remote PLC, no data will be read from the remote
PLC; an error message indicating the write failed will be returned. If an error is encountered reading
data, an error message indicating the read failed will be returned. In either case, the module will set
the applicable error bit and write the error code into the Command Error Word.
The following command block is used for the memory exchange command.
Offset Description
Hex Decimal
0 Command Error Word
0000 0
1 Command Code (Read Remote Memory)
0203 515
2 Connection Number (19221 - 19228)
3 Write Source: Starting V Memory Address in Local PLC
4 Number of Words to Write (1-254)
5 Write Destination: Starting V Memory Address in Remote
PLC
6 Command Timeout in seconds (0=Use Default) 0000 0
7 Read Source: Starting V Memory Address in Remote PLC
8 Number of Words to Read (1-256)
9 Read Destination: Starting V Memory Address in Local
PLC.
10 IP Address of Remote Device - High 16 bits
(UDP 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: IP Address Location bit in the Create Socket
command must be set to 1)
12 UDP Port Number of Remote Device
(UDP Only: IP Address Location bit in the Create Socket
command must be set to 1)
13 - 15 Unused (Set to 0)
0000 0
Offset 0 Command Error Word - Your PLC logic should set this to 0 so that any previous
error code is cleared. If a processing error is encountered, the module will write an
error code into this word.
Offset 1 Command Code - The Command Code for R
EAD REMOTE MEMORY is 515 (hex
0202).
Offset 2 Connection Number - Use the connection number that was established in the C
REATE
SOCKET command block.