Communication protocols
PROGRAMMING MANUAL 227
Revision 1.0
4.5.2 Communication set-up
The TJ1-DRT has two node number selectors. You can use the node
number selectors to assign a node number to the TJ1-DRT.
The DeviceNet node numbers range from 0 to 63. If you select a node
number with the node number selectors that exceeds this range, you will
select the node number that is set by software. The nodes that enable
software setting are 64 to 99.
To initialise the TJ1-DRT, use the BASIC DEVICENET command:
DEVICENET(unit_number, 2, 1, output_start, output_count, input_start,
input_count)
where:
• unit_number is the number of the TJ1-DRT unit.
• output_start is the start address of the output data range of VR
variables.
• output_count is the number of VR variables in the output data range,
maximum 32 variables.
• input_start is the start address of the input data range of VR variables.
• input_count is the number of VR variables in the input data range,
maximum 32 variables.
After you have executed the command DEVICENET(unit_number, 2, ...),
data arrays are automatically exchanged. The data exchanged between the
TJ1-DRT and the DeviceNet master is in 16-bit integer format. Each word
exchanged ranges from -32768 to 32767.
Note
If you use an OMRON DeviceNet master, it is advised to select
either input_count or output_count with a value of 4,8,16, or 32 for
the VR variables.
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