Epsilon EP-P Drive Reference Manual
107
Revision A4
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Any individual Modbus address can be deleted by selecting the parameter you wish to delete, and click on the
Remove
button. The address selected will be removed from the list. If you wish to delete all of the Modbus addresses that have been
created, then simply click on the
Remove All
button. All of the addresses will disappear and the Modbus window will be
empty.
Some Modbus addresses have been reserved and can not be assigned: 39980-39999 and 49501-49999.
NOTE
Some configuration software uses a 6 digit addressing base. The first digit is an indication of register or bit type. Thus 400001
in this software is equal to 40001 in Control Techniques Modbus RTU.
3.44
Modbus Master View
Modbus Master provides a method for the Epsilon EP drive to read or write directly to standard compliant Modbus slaves
(such as extended I/O blocks). The process of using this function is to first define the communication path to the slave(s), then
use the user program instructions to directly read or write either bits or words to the identified slave(s).
Configuring Modbus Master
The Modbus Master view, RTU Setup tab allows the user to configure the drive's serial (RS-485) port to operate as a Modbus
Gateway and/or as a Modbus Master. Modbus Gateway check box or Modbus Master check box must be selected otherwise
the port is configured as a Modbus slave. The RTU configuration comprises of two sets of parameters:
•
The serial port configuration (baud, parity and stop bits)
•
The timeouts and gaps for data transmission, see Figure 121
Figure 119:
Modbus Master View
Identifying Slaves
Slaves need to be identified before they can be used. The Slaves tab on the Modbus Master view specifies the attributes of
the slave(s). The quantity of slaves can be increased or decreased by changing the "number of slaves" field using the up and
down arrows. This will add or remove slave entries.
Each slave entry identifies how the drive can reach the slave, its unit ID, data representation and Modbus specific timing
attributes, see Figure 121
on page 108 for more details.
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