PLX51-PBM
Operation
PROFIBUS DPV0/DPV1 Master or Slave to EtherNet/IP™ or Modbus® Gateway
User Manual
ProSoft Technology, Inc.
Page 134 of 196
Table 5.51
– Modbus DPV1 Alarm Response Message Holding Register Format
Alarm Response
Holding
Register Offset
Description
Status
3
This is the status of the DPV1 data exchange. See appendix for
the definitions of the returned status.
Alarm Block Size
4
The size of the alarm data to follow.
Alarm Data
5
The retrieved alarm data.
Below is the basic structure of the alarm data:
Byte 0
– Alarm Type
1
– Diagnosis Alarm
2
– Process Alarm
3
– Pull Alarm
4
– Plug Alarm
5
– Status Alarm
6
– Update Alarm
Byte 1
– Slot Number
Range 0 - 254
Byte 2 - Bit 0 to 1
– Alarm Specifier
0
– No further differentiation
1
– Fault occurred and slot it not ok
2
– Fault disappeared, and slot is ok
3
– One fault disappeared, and slot is not ok
Byte 2 - Bit 3 to 7
– Sequence Number
Range 1 - 32
Byte 3 to 59
– Alarm Data Description
Modbus Auxiliary Map
The Modbus Auxiliary Map can be used to read or write Modbus data from the local
PLX51-PBM to a remote Modbus Slave. This will be enabled when
Enable Modbus
Auxiliary Mapping
has been enabled in the Modbus tab and configured for Modbus
Master. Up to 20 Modbus Slaves can be connected and up to 200 mapped items can
be configured.
IMPORTANT: When Modbus Auxiliary Mapping is enabled, the automatic polling of referenced Modbus
registers is disabled. It is the user’s responsibility to ensure that all the required PROFIBUS control and
data registers are collected from the appropriate remote Modbus slave devices.