ProSoft Technology MVI56-AFC - Manual (Page 170)

MVI56-AFC Backplane Communication MVI56-AFC ♦ ControlLogix Platform
User Manual Liquid and Gas Flow Computer
Page 170 of 316 ProSoft Technology, Inc.
February 25, 2011
When the function has been performed, bits 15 to 10 of the input block ID in the
IBA always echo the function code, and bits 9 to 0 contain information depending
on the block type. For meter-specific blocks, bit 9 reports whether the meter is in
alarm, bit 8 is zero, bits 7 to 5 contain the number of the active stream and bits 4
to 0 echo the meter number. For example, the above Meter Process Variable
Block may return this input block ID:
This block id reports that Meter 3 is measuring flow on its Stream 2 and is in
alarm (For firmware version 2.05 and later, the returned active stream number is
always non-zero; for earlier versions, having a single stream which was always
active, the returned active stream number is always zero. The ladder may use
this information to distinguish between multiple-stream and single-stream
firmwares). For non-meter-specific blocks, bits 9 to 0 may return status indicators
from the performance of the function, depending on the function.
Special Notes
Note that you can control the processing of the Output Function Blocks by the
AFC module through simple ladder logic implementation, as described next.
Managing Output Function Block(s) by manipulating Bit 8
For every Output Function Block (OFB) whether it is meter-specific or not, bit 8
allows you to control and manage its execution by the AFC Module in the
following way:
To disable processing of the OFB, set bit 8 to value 1
For normal processing of the OFB, set bit 8 to value 0
Managing Input Function Block(s) by Manipulating Bit 9
For every Input Function Block (IFB), which is a response by the AFC to the
associated OFB, whether it is meter-specific or not, bit 9 allows you to control
input to the controller from the AFC module in the following way:
To disable input to the controller via the IFB, set bit 9 to value 1
For normal data/response from the AFC module, set bit 9 to value 0
Note: The input block ID always returns the information described above, regardless of the settings
of bits 8 and 9 in the output block ID, unless otherwise stated in the individual function description.