ProSoft Technology PTQ-PDPMV1 - Manual (Page 198)

Hot Standby Support PTQ-PDPMV1 ♦ Quantum Platform
User Manual PROFIBUS DP Master Network Interface Module for Quantum
Page 198 of 306 ProSoft Technology, Inc.
August 12, 2014
Ping Message Structure
In addition to detecting a lost counterpart, the ping message is also used to
communicate status information between the local (active) and remote (passive)
Master.
The ping message would carry the following data (4 bytes).
Ping.req
Byte Data Description
0 HSBY local status Status information of the remote (passive) Master
1 HSBY Nr of local slaves Number of slaves accessible to the remote (passive)
Master
2 to 3 16-bit CRC CRC of the remote (passive) Master's database
Ping.res
Byte Data Description
0 HSBY local status Status information of the local (active) Master
1 HSBY Nr of local slaves Number of slaves accessible to the local (active)
Master
2 to 3 16-bit CRC CRC of the local (active) Master's database
7.2.8 PTQ Link Message
The PTQ modules require Ethernet UDP services for local (active) and passive
module communications.
Two types of services are provided.
1 Service port 3001 - Used for status data and CRC data of the standby to
primary unit (the CRC values are listed below from the PTQ-PDPMV1
Reference Guide).
Quantum
Address Unity
Address Word Offset Name Description
1043 %IW1043 43 PROFIBUS
configuration
checksum
CRC32 checksum for PROFIBUS Master
configuration downloaded from configuration
utility
1045 %IW1045 45 PTQ module
configuration
checksum
PTQ-PDPMV1 module configuration
checksum for module configuration
downloaded from configuration utility
2 Service port 3002 - Used for DPV1 messages. The transfer of these
messages is necessary to insure the messages are delivered and received
upon a switchover condition.