hello all:
I use a opc client to read data from AB controllogix through 1756-enbt.when i read a variable with the tag name 'a',the packet is following,but i don't know the meaning or the construction of the command data of the open connection service.I have not find the interpretation in the volum1 of CIP protocol.Who can tell me ,thank a lot firstly.
''
Service Packet #2
Service: Open Connection (Request)
0... .... = Request/Response: Request (0x00)
.100 1100 = Service: Open Connection (0x4c)
Request Path Size: 2 (words)
Request Path: Class: 0x72, Instance: 0x00
8-Bit Logical Class Segment (0x20)
Class: Unknown (0x72)
8-Bit Logical Instance Segment (0x24)
Instance: 0x00
Command Specific Data
Data: E80504000100
''
I use a opc client to read data from AB controllogix through 1756-enbt.when i read a variable with the tag name 'a',the packet is following,but i don't know the meaning or the construction of the command data of the open connection service.I have not find the interpretation in the volum1 of CIP protocol.Who can tell me ,thank a lot firstly.
''
Service Packet #2
Service: Open Connection (Request)
0... .... = Request/Response: Request (0x00)
.100 1100 = Service: Open Connection (0x4c)
Request Path Size: 2 (words)
Request Path: Class: 0x72, Instance: 0x00
8-Bit Logical Class Segment (0x20)
Class: Unknown (0x72)
8-Bit Logical Instance Segment (0x24)
Instance: 0x00
Command Specific Data
Data: E80504000100
''
