Setting The Unit Number - Omron K7DD User Manual

3 Installation and Wiring
3-7

Setting the Unit Number

When you use the communications function, set a
unit number for the K7DD.
You can set a number from 01 to 99. A power ON
reset process (level key operation on the Initial
Setting Level or Communications Setting Level, or
cycling of the power supply) is required. Make
sure that the power is OFF when you set the unit
number.
One host system (master) and up to thirty one
K7DD units (slaves) can be connected on the
same communications line. The unit number is used to distinguish between slaves.
The unit number is common to both the communications 1 terminals and communications 2 terminals.
Use 01 to 99 as the unit number. The slave address "00" is broadcast in the Modbus RTU protocol.
The power ON reset is a reset process inside the K7DD. It is executed by doing as follows:
• Cycling the power supply
• Executing the Software Reset Command via communications
• Moving to the Monitoring Level with key operations (by pressing the Level Key for 1 second or more in the operation
stopped state)
The master executes a command by specifying
the unit number in the communications command.
Therefore, the slaves connected on the same
communications line must not have duplicate unit
numbers.
If the unit number is duplicated, there will be a
clash between the responses from multiple
slaves, which will result in a communications
error.
Set the following addresses for communications settings with the K7DD Support Tool.
IP address: IP address of the communications converter
Slave address: Unit number of the K7DD
The default values of the communications settings on the K7DD (Modbus RTU) are as follows. These values are used
for explanation.
• Baud Rate:
• Data Length:
• Stop Bits:
• Parity:
The communication settings with the K7DD Support Tool should be in accordance with those of Ethernet on the
computer (Modbus TCP).
• Computer (master):
• K7DD (slave):
3 - 16
115.2 kbps
Always 8 bits
1 bit
Even
Static IP address
Unit number
No. 01 No.02
Response
from No. 2
No. 01 No.02
Power Line Data Generator User's Manual (N233)
Master
Command
No.02
to No. 2
Master
No.02