DESCRIPTION AND OPERATION
LOGIC POWER
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for only one output channel. The AOM converts a 24 bit per-
centage value (REAL-2/3) to generate an analog output.
The value in a write point message from a master module is
dependent on FC 28 in the master module configuration. An
output point (channel number) must be defined in a FC 28
block to output a control signal for that point.
NOTE: A value received by the AOM must be within its input range.
If it is not, the AOM will drive the corresponding output to either a
maximum or minimum level. This does not cause an error to occur,
but does cause the AOM to output incorrect signals. To avoid this,
the values sent to the AOM must be within the 0 to 100 percent
range when using the 1 to 5 VDC or 4 to 20 mA range, or -25 to 100
percent when using the 0 to 10 VDC range.
The AOM sends a reply message to acknowledge receipt of a
write point message.
Read Point
A master module or operator interface (e.g., Configuration and
Tuning Terminal) can read an analog point value from the AOM
by generating a read point message (i.e., monitor function).
This message contains the destination module address (AOM
address) and block number (output channel number) to read.
After receiving the message, the AOM responds with a reply
message that contains the requested data.
Read Status
A communication module (i.e., Bus Interface Module (BIM) or
Network Processing Module (NPM)) or operator interface can
acquire the AOM operating status by generating a read status
message. After receiving this message, the AOM responds with
a reply message containing status information. When status is
requested from an AOM, it is mainly to determine if the AOM is
on-line.
An AOM also sends a module status message in response to an
exception report poll from a BIM/NPM.
LOGIC POWER
Logic power (+5 VDC) drives the AOM logic circuits. It connects
through the top 12-pin card edge connector (P1) shown in Fig-
ure
. P3 su24 VDC to operate the analog output
circuits.
