Technical data

76
W&T
Diagnostics status writing of the Master: Reset (corresponds to
„Delete Report“) - regardless of the written value.
1
At present the configuration byte is 0, i.e. only Modbus
and Big Endian are supported. Others (JBUS, LIttle
Endian) are available on request.
3.10.4 Modbus - Alarm triggering incl. special memory
An alarm trigger bit in the bit memory range can be used to
trigger individual device alarms with the rising edge. The bits
are located starting at Address 1800 (Alarm 1). While the bit is
set the alarm is active. Resetting the corresponding bit also
clears the alarm. The Modbus alarm can be ORed with the other
triggers in the alarm.
The device provides memory (starting at register 7000) for free
use to report and visualize states in the Modbus TCP using the
Web-IO network services. This allows the Modbus client to save
any values (e.g. calculation results, states, measurement values
from other Modbus clients) to this memory. The client
determines when these values are passed along via alarm. One
alarm trigger bit (starting at register 1800) is available per
alarm. As long as the bit is set the alarm is active.
The time window function in the alarms can be combined with
the Modbus alarm trigger bit. For more information about this,
see the description under „Alarms - CRON services“. The output
functions can also be used for example for sensor alarms, and
are described after the alarms in this manual.