ABB Symphony Harmony Series, Инструкция, Страница: 195 / 402

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Function Codes
value is at or below the low alarm limit. Likewise, a high alarm
condition will be reported when the value is at or above the
high alarm limit.
An alarm state specification in digital I/O channel function
codes is used to set up alarming. One of the two digital chan-
nel states can be selected as an alarm state. When the input or
output readback toggles to the designated alarm state, an
alarm condition will be reported.
Shaping Algorithms
The following shaping algorithms (i.e., computing functions)
can be used with the analog input channel function code:
•
Function generator (FC 1).
•
Square root (FC 7).
•
Polynomial (FC 167).
An engineering unit conversion/shaping algorithm precedence
specification in the analog input channel function code deter-
mines when the shaping will be applied, either before or after
engineering unit conversion.
Test Status (FC 226)
The test status function code (FC 226) provides access to Har-
mony I/O status information. Any I/O block specific function
code can be tested for status (i.e., I/O device definition and
I/O channel function codes). Refer to the
Function Code Appli- Function Code Appli- Function Code Appli- Function Code Appli-
cation Manual cation Manual cation Manual cation Manual for the statuses that can be accessed with this
function code.
The test status function code checks the status of up to four
status conditions from the same function code. It is a four
input logical OR function that sets the output to a logic zero if
all tested status conditions are false, and to a logic one if one
or more tested status conditions are true.