Micromod MOD: MODBUS RTU Communications Guide User Manual
Page 21

MODBUS RTU
COMUNICATIONS GUIDE
17
MODBUS WITH INTOUCH AND COMMANDER 300
Below are configuration entries that have been tested with the InTouch Modbus DDE Server and C300.
Table 8. MODBUS with InTouch and Commander 300
Hardware
584/984 PLC
String Variable Style
Full Length
Register Type
Binary
Block I/O Sizes
Coil Read - 16
Register Read - 8
Coil Write* - 8
Register Write - 8
* NOTE:
The Commander supports only Single-Coil writes (Function Code 05), so
Block I/O does not apply. InTouch allows a minimum setting of 8.
In the InTouch Display Configuration Window;
1. Select the desired Value Display Wizard to place a display field into the window
2. Double-click on the display field to configure it
3. Assign a Tagname
4. Check the Allow Input box if you wish to write values from the PC to the Commander
5. Define
the
Tagname
6. Select DDE Real for analog values
7. Set the Min and Max EU values to match the Commander Display Range
8. Set the Min and Max Raw values to the Response/Entry range specified in the Modbus guide
9. Select DDE Access Name as defined in the I/O Server
10. Specify the Item as a 5-digit Modbus address (i.e. 40051 for Process Variable 1)
11. Coil addresses in the Commander range from 00011 to 00181
12. Register addresses in the Commander range from 40011 to 40230
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