Omron NV3Q Series, Connection Manual

Page: 117 / 145

93
Modbus (RTU Mode | Temperature Controller)
Section 10-3
10-3 Modbus (RTU Mode
|
Temperature Controller)
PLC Model Selection • Select Modbus (RTU Mode | Temperature Controller)
Select this setting when connecting to OMRON EJ1 Temperature Controllers
and similar devices.
Modbus (RTU mode | Temperature Controller) can be selected only for the
NV4W or NV3Q.
Up to 31 Temperature Controllers can be connected.
Applicable Devices
Bit/word devices No. Comments
Bit devices Treated as holding registers Area 4 (holding register) + Tem-
perature Controller parameter
address (0000 to FFFF) + Bit
(.0 to .F) or internal memory
address. Example: Specify "4" followed
by the parameter address in
the Temperature Controller and
then the bit position in hexa-
decimal, such as "4000B.F".
Word devices Treated as holding registers Area 4 (holding register) + Tem-
perature Controller parameter
address (0000 to FFFF) or
internal memory address. Example: Specify "4" followed
by the parameter address in
the Temperature Controller in
hexadecimal, such as "4026D".
Application Example 1: Allocating the RUN Command for Channel 1 of an EJ1 to a Touch Switch
(1) Paste a function switch (FSW) on the screen.
(2) Select Value Set (1W) for the Others Option on the Basic Setup
Tab Page.
(3) Click the Output Button. The Address Setting Dialog Box will be
displayed. Select 4 for the area, input FFFF for the address, and
click the OK Button.
(4) Click the Dec Button for the Value, change it to the Hex Button,
and display the Set Value Dialog Box. Enter 0A00 for the value
and click the OK Button.
Application Example 2: Displaying the PV for Channel 1 of an EJ1 Temperature Controller in EU Units
(1) Paste a data part (Data) on the screen.
(2) Input 4 for the Number of Digits in the Data to Display Area on
the Basic Setup Tab Page and select DEC (1W) for the Data
Format.
(3) Click the Address Button. The Address Setting Dialog Box will
be displayed. Select 4 for the area, input 0200 for the address,
and click the OK Button.
Additional Information
• Function codes 03 hex (read holding register) and 06 hex (write holding regis-
ter, one word) are used for Modbus (RTU Mode | Temperature Controller).
• The default system memory area in the NV-Designer allocates 40000 to 40002 to
send to the connected device. When connecting to slaves, such as Temperature
Controllers, change this setting to GDT or WGR addresses in internal memory.
• For information on how to input addresses, refer to the NV-series Programming
Manual (Cat. No. V104).
• For details on addresses for OMRON EJ1 Temperature Controllers, refer to the
parameter list and status list in the appendices of the EJ1 Modular Temperature
Controller User's Manual (Cat. No. H142).