DL205 User Manual, 4th Edition, Rev. B
Chapter 4: System Design and Configuration
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Modbus Port Configuration
In
Direct
SOFT, choose the PLC menu, then Setup, then “Secondary Comm Port”.
• Port:
From the port number list box at the top, choose “Port 2”.
• Protocol:
Click the check box to the left of “MODBUS” (use AUX 56 on the HPP, and select
“MBUS”), and then you’ll see the dialog box below.
• Timeout:
The amount of time the port
will wait after it sends a message to get a
response before logging an error.
• RTS On Delay Time:
The amount of
time between raising the RTS line and
sending the data.
• RTS Off Delay Time:
The amount of
time between resetting the RTS line after
sending the data.
• Station Number:
To make the CPU port
a Modbus master, choose “1”. The
possible range for Modbus slave numbers
is from 1 to 247, but the DL250–1 and
DL260 WX and RX network instructions
used in Master mode will access only
slaves 1 to 90. Each slave must have a
unique number. At powerup, the port is
automatically a slave, unless and until the
DL250–1 or DL260 executes ladder logic
network instructions which use the port
as a master. Thereafter, the port reverts
back to slave mode until ladder logic
uses the port again.
• Baud Rate:
The available baud rates
include 300, 600, 900, 2400, 4800,
9600, 19200, and 38400 baud. Choose a higher baud rate initially, reverting to lower baud rates if
you experience data errors or noise problems on the network. Important: You must configure the
baud rates of all devices on the network to the same value. Refer to the appropriate product manual
for details.
• Stop Bits:
Choose 1 or 2 stop bits for use in the protocol.
• Parity:
Choose none, even, or odd parity for error checking.
• Echo Suppression:
Select the appropriate radio button based on the wiring configuration used on
port 2.
Then click the button indicated to send the Port configuration to the CPU, and click Close.
ý
ý
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230
240
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-1
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0
NOTE:
The DL250–1 does not support the
Echo Suppression feature
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