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8-32 Field Control™ Genius® Bus Interface Unit User’s Manual
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October 1999 GFK-0825F
8
Read I/O Forces
Subfunction Code: 40 hex
This datagram can be used to set read force information from a Genius Bus Interface Unit. The
information read is determined by the value specified in the datagram.
Byte # Description
0 Force Table Requested: 0 = input enable
1 = output enable
2 = input values
3 = output values
•
To read which inputs are forced, specify the number 0 in the datagram.
•
To read which outputs are forced, specify 1 in the datagram.
•
To read forced input values, specify 2 in the datagram.
•
To read forced output values, specify 3 in the datagram.
In the BIU, two force enable tables show which points are forced. Two force values tables show the
forced values. Each table contains a byte of data for each byte of discrete data followed by a word
of data for each channel of analog data. For example, if a BIU is configured to have 6 bytes of
discrete input data and 6 channels of analog input data, the input force enable table and input force
value table would look like this:
Force Enabled Table Force Values Table
Byte # Description Byte # Description
0 1st 8 discrete inputs force enable 0 1st 8 discrete inputs force values
1 2nd 8 discrete inputs force enable 1 2nd 8 discrete inputs force values
2.2.
3.3.
4.4.
5 last 8 discrete inputs force enable 5 last 8 discrete inputs force values
6, 7 1st channel analog inputs force enable 6, 7 1st channel analog inputs force values
8, 9 2nd channel analog inputs force enable 8, 9 2nd channel analog inputs force values
10, 11 . 10, 11 .
12, 13 . 12, 13 .
14, 15 . 14, 15 .
16, 17 6th channel analog inputs force enable 16, 17 6th channel analog inputs force value
Note that it is possible to have no discrete inputs or outputs or no analog inputs or outputs.
Read I/O Forces Reply
Subfunction Code: 41 hex
This datagram provides the information requested by a Read I/O Forces datagram.
Byte # Description
0 Force Table Requested: 0 = input enable
1 = output enable
2 = input values
3 = output values
1 - 128 Input/Output force enable/value table data
For discrete data, a 1 in a bit position in the force enable table corresponds to an enabled force for
that point. For analog data, the value FFFF (hex) in a word position in the enable table corresponds
to an enabled force for an analog channel.