ProSoft Technology PTQ-PDPMV1 - Manual (Page 205)

PTQ-PDPMV1 ♦ Quantum Platform Hot Standby Support
PROFIBUS DP Master Network Interface Module for Quantum User Manual
ProSoft Technology, Inc. Page 205 of 306
August 12, 2014
Active and Passive HSBY Master Status Data High Byte - Bits 8 to 15
The "COM-bit" would be set to one when the counterpart is present on the
network (that is, ping sequence is successfully running). The other bits (8 to 14)
are considered valid only when the "COM-bit" equals one.
If the ping sequence is terminated the "COM-bit" and all other bits (8 to 14) are
set to zero.
All bits would be set to zero at power-up, and when the HSBY-state equals "Not
connected".
HSBY Nr of Active Slaves Byte
This byte will indicate the number of slaves accessible to the local Master. Based
on this information, the high-level system could switch to the Master that
recognizes the most slaves.
Note that this register only contains valid data when the "HS-bit" in register
"HSBY Local status" is set.
HSBY Nr of Passive Slaves Byte
This byte will indicate the number of slaves accessible to the counterpart (that is,
a reflection of the counterpart's "HSBY Nr of local slaves" register). Based on this
information, the high-level system could switch to the Master that recognizes the
most slaves.
Note that this register only contains valid data when the "COM-bit" in register
"HSBY Remote status" indicates that the counterpart is present. When the
"COM-bit" is cleared, this register would be set to zero.