Rockwell Automation 1757-ABRIO Process Remote I/O (RIO) Communication Interface Module - Manual (Page 92)

90 Publication 1757-UM007D-EN-P - December 2008
Chapter 8 Supported 1771 Modules
2. For each channel select the range for each channel and enter the
scaling values.
The low scaling value corresponds to the minimum output
voltage or current; the high scaling value corresponds to the
maximum output voltage or current.
3. Set the LAST STATE jumper setting to match the jumpers on the
1771-OFE module.
The setting can be Last, Min, Mid, or Max. This value determines
how the 1757-ABRIO module responds to a loss of
communication with the host controller.
4. Set the Update Time.
The Update Time is the rate at which the block transfer write,
which writes data to the 1771-OFE module, occurs. The range of
values is from 1 to 16382 ms. This sets the requested update
rate; the actual rate depends on the baud rate, the number of
racks on the RIO network and whether block transfers are
running to other modules in the same rack.
5. Click OK to accept the module configuration.
I/O Data
4 words of floating point data are written to the 1771-OFE module.
You map this data to a numeric write tag.
EXAMPLE
If the scaling values are 10.0 and 22.5 and the range is
configured for 0 to 5V dc, a value of 10.0 produces an output of
0V dc and a value of 22.5 produces an output of 5V dc. The
range of scaling values is -3.4e38 to 3.4e38.
Values received from a controller that are outside the scaled
range are clamped to the scaled range value.
1771-OFE I/O Data
Data Word Description
0 Channel 1 data
1 Channel 2 data
2 Channel 3 data
3 Channel 4 data