PLX51-PBM Setup
PROFIBUS DPV0/DPV1 Master or Slave to EtherNet/IP™ or Modbus® Gateway User Manual
ProSoft Technology, Inc. Page 36 of 196
3.5.8 Modbus Auxiliary Map
The Modbus Auxiliary Map configuration is shown in the figure below. This table will
be enabled when Enable Modbus Auxiliary Mapping has been enabled in the
Modbus tab and configured for Modbus Master. This will allow the user to read
and/or write any internal PLX51-PBM Modbus Register to any Modbus Slave. 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.
The PLX51-PBM Modbus Auxiliary Map configuration window is opened by either
double clicking on the module in the tree or right-clicking the module and selecting
Configuration.
Figure 3.28 – PLX51-PBM Modbus Auxiliary Map configuration
The Modbus Auxiliary Map configuration consists of the following parameters:
Table 3.8 - Modbus Auxiliary Map configuration parameters
This is the Modbus function that is used with the Modbus Slave.
Read – Read a Modbus Register (eg. HR, IR, CS, or IS) from a
Modbus Slave.
Write – Write a Modbus Register (eg. HR or CS) to a Modbus Slave.
Modbus Register Type:
CS – Coil Status
IS – Input Status
IR – Input Register
HR – Holding Register
The local PLX51-PBM Modbus address.
The number of Modbus elements to read or write.
The remote slave Modbus address.
The IP address of the remote Modbus TCP slave.
The Modbus Node address of the remote Modbus slave.
How the data is formatted before reading or writing from/to the
Modbus slave.
None – No reformatting will be done.
BB AA – 16bit Byte swap
BB AA DD CC – 32bit Byte Swap
CC DD AA BB – Word Swap
DD CC BB AA – Word and Byte Swap
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