Baldor Modbus Plus Bedienungsanleitung PDF herunterladen (Seite 13)

AN00174-001 Modbus TCP Fieldbus Option for MotiFlex e100.doc

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Your Spy Window should look something like this...

Now we returned to the MiniHMI application and clicked on the ‘Synch Read’ button to initiate a

read of the Modbus registers. The following data appeared in the data view area…

Next we changed the Quantity of registers to read to 4 and clicked on ‘Synch Read’ again…

We can see from these results that the data is loaded into the least significant word and the

upper word is not used when using Integer (16-bit) data.

Next we changed the data format to LONG (32-bit integer) and the Address/Quantity to 256 and

2 respectively…

NetData Channels 3 and 4 are the Transmit PDOs

so use the WorkBench Spy Window to ‘poke’ some

Integer range (+/- 32767) data into these two

locations (highlight element 3 or 4 in the

WorkBench Net Data Watch Window and enter a

new value at the bottom of the Spy Window (click

on the Green Tick to accept this).

We entered 1234 for NetData 3 and 5678 for

NetData 4…

Note that our value in NetData 3 (1234) consumed two

Modbus registers. This is because NetData is a 32-bit

value and the Modbus registers area all 16-bit.

Now we can see the value for NetData 3 in register 256

and the value for NetData 4 in register 258. If we try to

read a value greater/less than +/-32767 then the data

becomes ‘corrupted’.

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Baldor Modbus Plus Bedienungsanleitung Seite 13