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Setting the NV Configuration from the NV-Designer Section 6-2
■ NV4W/NV3Q
Note When connecting to an OMRON EJ1 Temperature Controller using Modbus-
RTU, set a transmission delay of at least 5 ms in the communications parame-
ters in the NV Configuration of the PT. Communications may not be performed
correctly if a transmission delay of 4 ms or less is set. Use a value of the least
5 ms (default) for the port B send wait time in the EJ1. Communications may
not be performed correctly if a send wait time of 4 ms or less is set.
Item Description
PLC Unit No. (0 - 31) Specifies the Host Link unit number of the connected PLC
from 0 to 31. This setting is required only the Host Link unit
number of the PLC is not 0.
If communications are performed using Modbus, set the PLC
unit number to between 1 and 247.
COM Port (Con-
nected to PLC or
External Device)
Sets the baud rate and transmission format for communica-
tions with the connected PLC.
• Baud Rate
Select from 9,600, 19,200, 38,400, 57,600, or 115,200 bps.
• Data Length
Select 7 bits or 8 bits.
• Stop bits
Always 1 bit.
•Parity
Select none, odd, or even.
Communication
Error Handling
Click the Setup Button and open the Communications Error
Handling Dialog Box to set the following parameters.
• Number of retries
Set the number of retries for communications errors to
between 0 and 255.
• Waiting time
Set the number of retries for communications errors to
between 0 and 64 seconds.
• Display Error Codes
Select Off, On (hold), or On (Unhold).
Transmission Delay The time between receiving data from the PLC and when data
is sent from the PT can be adjusted. A delay time longer than
the set value can be obtained by setting the transmission delay
parameter. Set this parameter when data transmission from
the PT is too fast for the PLC to receive it properly. The setting
range is between 0 to 1,000 ms.
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