Prosoft-technology MVI69-EGD Manual de usuario descargar pdf (Pagina 70)

MVI69-EGD ♦ CompactLogix or MicroLogix Platform Reference

GE Ethernet Global Data Communication Module

Page 70 of 96 ProSoft Technology, Inc.

November 3, 2008

Packet

Info

Description Data

State:

24 4 0x HH HH HH HH

Exchange Length:

28 4 0x HH HH HH HH

Message Count:

32 4 0x HH HH HH HH

Missed Count:

36 4 0x HH HH HH HH

Refresh Error Count:

40 4 0x HH HH HH HH

Reserved:

44 4 0x HH HH HH HH

Command NAK PDU

PDU Type = 18

Command NAK Response.

The command NAK response may be sent by a responder to any command

received on the command port that is in error. Use of the command NAK allows

the responder to give more precise and detailed information about the nature of

the error to the requester. The command NAK shall not be sent in response to a

NAK message.

The NAK message is returned to indicate a syntactic error in a request message.

It should only be used if the request is unintelligible. Thus, whenever possible,

the corresponding response to a received request message shall be returned.

Packet

Info

Description Data

Source Port:

7937 (0x 1F01)

Destination Port:

7937 (0x 1F01)

Length:

xx bytes (0x 00 XX)

Checksum:

xxxxx (0x XX XX)

EGD's PDU Field: Offset Bytes Hex code

PDU Type:

0 1 0x 12

Message Flag:

1 1 0x HH

Request ID:

2 2 0x HH HH

PVN1:

4 1 0x 01

Status:

5 1 0x HH

Message Length:

6 2 0x HH HH

Producer ID:

8 4 0x HH HH HH HH

Exchange ID:

12 4 0x HH HH HH HH

UDP

EGD:

Error Code:

16 2 0x HH HH

Reserved:

18 2 0x HH HH

Offending

Message:

20 16 0x HH . . . HH

Error String:

(up to 80

characters)

36 XX 0x HH . . . HH

1 2 ... 65 66 67 68 69 70 71 72 73 74 75 ... 95 96

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