Hallo all:
After foward open ,i send the following CIP read MSG to PLC(1756-L61,1756-ENBT);no data response.If you have done this before and can give me some directions, I would very much appreciate it.
Encapsulation Header
Command: Send Unit Data (0x0070)
Length: 30
Session Handle: 0x13024800
Status: Success (0x00000000)
Sender Context: 0000000000000000
Options: 0x00000000
Command Specific Data
Interface Handle: CIP (0x00000000)
Timeout: 1
Item Count: 2
Type ID: Connected Address Item (0x00a1)
Length: 4
Connection Identifier: 0x00000000
Type ID: Connected Data Item (0x00b1)
Length: 10
Sequence Count: 0x0002
Common Industrial Protocol
Service: Open Connection (Request)
0... .... = Request/Response: Request (0x00)
.100 1100 = Service: Open Connection (0x4c)
Request Path Size: 2 (words)
Request Path: a
Extended Symbol Segment (0x91)
Data Size: 1
Data: a
Pad Byte (0x00)
Command Specific Data
Data: 0100
the response from PLC :
Frame 4 (60 bytes on wire, 60 bytes captured)
Ethernet II, Src: Rockwell_3f:81:0e (00:00:bc:3f:81:0e), Dst: Giga-Byt_ca:bc:52 (00:14:85:ca:bc:52)
Internet Protocol, Src: 192.168.0.251 (192.168.0.251), Dst: 192.168.0.249 (192.168.0.249)
Transmission Control Protocol, Src Port: EtherNet/IP-2 (44818), Dst Port: aic-oncrpc (2786), Seq: 2, Ack: 55, Len: 0
After foward open ,i send the following CIP read MSG to PLC(1756-L61,1756-ENBT);no data response.If you have done this before and can give me some directions, I would very much appreciate it.
Encapsulation Header
Command: Send Unit Data (0x0070)
Length: 30
Session Handle: 0x13024800
Status: Success (0x00000000)
Sender Context: 0000000000000000
Options: 0x00000000
Command Specific Data
Interface Handle: CIP (0x00000000)
Timeout: 1
Item Count: 2
Type ID: Connected Address Item (0x00a1)
Length: 4
Connection Identifier: 0x00000000
Type ID: Connected Data Item (0x00b1)
Length: 10
Sequence Count: 0x0002
Common Industrial Protocol
Service: Open Connection (Request)
0... .... = Request/Response: Request (0x00)
.100 1100 = Service: Open Connection (0x4c)
Request Path Size: 2 (words)
Request Path: a
Extended Symbol Segment (0x91)
Data Size: 1
Data: a
Pad Byte (0x00)
Command Specific Data
Data: 0100
the response from PLC :
Frame 4 (60 bytes on wire, 60 bytes captured)
Ethernet II, Src: Rockwell_3f:81:0e (00:00:bc:3f:81:0e), Dst: Giga-Byt_ca:bc:52 (00:14:85:ca:bc:52)
Internet Protocol, Src: 192.168.0.251 (192.168.0.251), Dst: 192.168.0.249 (192.168.0.249)
Transmission Control Protocol, Src Port: EtherNet/IP-2 (44818), Dst Port: aic-oncrpc (2786), Seq: 2, Ack: 55, Len: 0
