ProSoft Technology MVI69-EGD User Manual
Page 76
MVI69-EGD ♦ CompactLogix or MicroLogix Platform
Reference
GE Ethernet Global Data Communication Module
Page 76 of 96
ProSoft Technology, Inc.
November 3, 2008
PDU Type = 37
Masked Write Response.
The Masked Write Response provides an acknowledgment to the masked write
request message. A positive response indicates that all of the data has been
written to the responding device. An error response indicates that one or more of
the transfers to the responding device failed. Responders shall use all available
means to assure that a write is performed in its entirety or not performed at all.
Requesting applications are advised that if partial failures of the write can cause
problems with the control algorithm, they should include only one cell in each
write to assure complete knowledge of the disposition of the write request.
Requesters should be aware that some responding devices are not capable of
setting more than one bit in a request. Before sending a mask with more than
one bit set, the requester should assure that the responding device supports
multiple bit writes.
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 25
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
Configuration Signature:
8
2
0x HH HH
Address Type:
10
1
0x HH
Cell count:
11
1
0x HH
Producer ID:
12
4
0x HH HH HH HH
Exchange ID:
16
4
0x HH HH HH HH
Time Stamp:
20
8
0x HH . . . HH
UDP
EGD:
Reserved:
28
4
0x HH HH HH HH