PLX51-PBM
Operation
PROFIBUS DPV0/DPV1 Master or Slave to EtherNet/IP™ or Modbus® Gateway
User Manual
ProSoft Technology, Inc.
Page 138 of 196
Alarming
The PLX51-PBM supports DPV1 Alarming when operating as a PROFIBUS Slave.
The user can trigger an alarm from the Modbus Device Control Register offset which
will notify the PROFIBUS Master that a new alarm has been generated. When the
PROFIBUS Master sends a DPV1 alarm read command, the PLX51-PBM will access
the configured Modbus Holding address to provide the required data for the specific
alarm.
NOTE: The PLX51-PBM can only allow one alarm to be triggered at a time.
To trigger an alarm notification for the PROFIBUS Master the user will need to toggle
(from 0 to 1) the Alarm Trigger bit in the Device Control Register Offset as shown
below:
Table 5.55
– Modbus Slave Device Control
CS Offset
Description
Device Control
128 + (8 x [Station Address])
DPV1 Alarm Trigger
Once the alarm has been triggered the PLX51-PBM will read/write the alarm data
from the configured Modbus Holding Register address range and add it to the
PROFIBUS diagnostics (which will then be read by the PROFIBUS Master) as shown
below.
Figure 5.17
– DPV1 Alarm Holding Register address
