Allen-Bradley controllogix 1756-L63, User Manual

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Publication 1756-UM001E-EN-P - August 2002
Communicate with 1771 I/O Over a ControlNet™ Network 9-11
Configure the Messages
1. In the MSG instruction, click .
2. Select a configuration:
3. Click the Communication tab.
4. How many devices require block transfer instructions?
5. Choose OK .
...
If you want to: For this item: Type or select:
read input data Message Type Block Transfer Read
Number Of Elements number of INTs to read
Destination Tag int_buffer_read [0]
write configuration or output data Message Type Block Transfer Write
Source Tag int_buffer_write [0]
Number Of Elements number of INTs to write
For this item: Type or select:
Path Path to the 1771-ACN module:
A. Click Browse…
B. Select the 1771-ACN module that is in the chassis with the block transfer module.
C. Choose
OK .
Although your logic will control the path, the Message Properties dialog box requires an initial selection.
RIO or ControlNet ControlNet
Slot slot number of the BT module
Although your logic will control this value, the Message Properties dialog box requires an initial value (0 - 15).
If: Then:
16 or less devices Leave the Cache Connection check box selected (checked).
more than 16 devices A. Select 16 devices that require the most frequent
updates.
B. Is this message to one of those devices?
If: Then
Yes Leave the Cache Connection check box
selected (checked).
No
Clear the Cache Connection check box.
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