Rockwell Automation MD65 EtherNet/IP Communication Module - Manual (Page 144)

C-16 EtherNet/IP Communications Module
N-Files
MDI Port Assignments
MDI Port No. Single-Drive Mode Multi-Drive Mode
0 The drive Drive 0
1 The module Drive 1
2 The slave Drive 2
3 Not supported Drive 3
4 Not supported Drive 4
5 Not supported The module
N-File Description
N40 This N-file lets you use Emulated Block Transfer messages to read and write
many types of MDI messages. To use Emulated Block Transfer messages, you
send a Write message to N40:0 – N40:63, wait until the module responds with a
reply message, and then read the response data in N40:0 – N40:63 with a Read
message.
Bits 15 to 8 are the Most Significant Byte. Bits 7 to 0 are the Least Significant
Byte.
Write Read
Bits 15 0 15 0
N40:0 0x00 Length (in Bytes) 0x00 Length (in Bytes)
N40:1 MDI Port 1 0x81 Status Size Status Type
N40:2 0x00 CIP Services Data
(length varies based on message)
N40:3 CIP Class
N40:4 CIP Instance
N40:5 CIP Attribute
N40:6 Data
(length varies based on message)
…
N40:63
1 See MDI Port Assignments listed on page C-16.
N41 This N-file lets you read and write control I/O messages. You can write control I/O
messages only when all of the following conditions are true:
• The module is not receiving I/O from a scanner. For example, there is no
scanner on the network, the scanner is in idle (program) mode, the scanner
is faulted, or the module is not mapped to the scanner.
• The value of N42:3 is set to a non-zero value.
Write Read
N41:0
N41:1
N41:2 Logic Command Word
Unused
Reference Logic Status Word
Unused
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