CHAPTER 11 - PXG600E SYSTEM INTEGRATION
EATON
PXG600E User Manual • IM02603003E
Rev 5, 11-May-2012 • Firmware Version 5.03:3835
170
Addressing the Target Downstream Device
Each “downstream” device is assigned a unique Modbus TCP Unit ID. This
unit ID can be found on the Device Summary. Refer to the
PXG600E
Device Summary Web Page Details on page 155
for examples. This
unit ID is used as the Modbus TCP unit identifier by the Modbus TCP client.
To access data from a “downstream” device, the Modbus TCP client
generates a request to the IP address of the PXG600E with the unit identifier
set to access the targeted “downstream” device. Consult the user
information of your Modbus TCP client to determine how to set the unit
identifier on a message.
Downstream Device Register Map
Each “downstream” device supported by the PXG600E has a fixed register
map. This map contains all of the data that is identified in the EDS file for the
device. The register maps for all supported devices are included on the
PXG600E CD-ROM that is shipped with the PX600. This map shows the
register assignments and data formats for the supported parameters.
Triggering INCOM Slave Actions from Modbus TCP
The PXG600E supports a selected set of slave actions on some of the INCOM
devices. The supported slave actions are listed in the register map of the
device. See the user’s manual for the specific INCOM device for information
on the specific slave action command functionality.
The slave action command is sent to the target INCOM device every time
you perform a write to the corresponding Modbus TCP register. You only
have to perform the write once to trigger the command. Use the write value
of “1.”
NOTICE: Additional slave actions are available for select INCOM
devices. Refer to
www.eaton.com/pxg
for these updated EDS files.
Supported Function Codes
The PXG600E supports the following Modbus TCP function codes:
Modbus Pass-Through to Modbus RTU Devices
The PXG600E supports a direct pass-through mode to Modbus RTU devices.
This mode of operation is only available for the Modbus RTU “downstream”
devices.
Code
Description
01
Read coil status
02
Read input status
03
Read Holding Register
04
Read Input Register
05
Force Single Coil
06
Write Single Register
15
Force Multiple Coils
16
Preset Multiple Registers
