Rockwell-automation RECOMM-ENET EtherNet/IP Communications Module Bedienungsanleitung PDF herunterladen (Seite 150)

C-14

EtherNet/IP Communications Module

N-Files

N-File Description

N40 This N-file lets you use Emulated Block Transfer messages to read and write

many types of DPI 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 DPI Port 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

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 module is not receiving Peer I/O from another module.

• The module is configured to receive I/O (for example, the DPI I/O Cfg

parameter).

• The value of N42:3 is set to a non-zero value.

Write Read

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Rockwell-automation RECOMM-ENET EtherNet/IP Communications Module Bedienungsanleitung Seite 150