KROHNE Summit 8800 Vol 3 - Manual (Page 134)

134 www.krohne.com 08/2013 - MA SUMMIT 8800 Vol3 R02 en
SUMMIT 8800 COMMUNICATION 08
The timer is reset upon receipt of a valid Modbus packet on a Modbus slave port that has the
‘use Modbus timeout’ option selected.
8 .4 .1 .3 Modbus slave log setting
The 4 log parameters are needed to include record based transfer of historical data from an
alarm/event log and data logs into the modbus list. For normal modbus this is not possible, so
these parameters are irrelevant.
Figure 181 Modbus slave log settings
Log offset Set to 1 if the master assumes that the first log index is one. Otherwise 0.
First log Set the order of the log: the newest first or the oldest first
Invalid data selection What to do with an invalid log request: return clear data, return filled data,
or create an exception
Log event number Select the log which contains the events
8 .4 .1 .4 Modbus address offset setting
Figure 182 Modbus slave address offset settings
Use address offsets When enabled, per Modbus function, address offsets can be added to the
received modbus starting address. Normally not used.
Function offsets The address offset for the function