Nidec H300 - Object Configuration; Object Status; Supported Attributes for Analog Inputs; COS Status Bits

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HVAC Drive H300 187

Issue Number: 3

Table 10-26 Supported attributes for analog inputs

Object configuration

The Analog Input Object Configuration byte has the following format:

Table 10-27 Analog input object configuration byte

It is possible to read and write to the Object Configuration byte. Setting the "COS Enable" bit will enter this point into the set of points to be scanned

for change whenever a "Poll without Acknowledge" command is received.

Setting the "Warning Enable" and the "Alarm Enable" bits will cause an alarm/warning threshold check to be performed whenever this point is read

(status or current value) which may then set the COS alarm/warning bits in the status byte.

Object status

The Analog Input Object Status byte has the following format:

Table 10-28 Analog input object status byte

The "Reliable/Unreliable" bit will be set if the drive has tripped and the parameter is latched on trip.

The "Override Active" bit will be set if an analog input point is overridden. This indicates that the current value being read is an "override" and does not

necessarily reflect the value existing in the drive. This action would normally be done during testing of the Metasys building automation network. The

only way to clear the "override active" bit is to issue an "Override Release Request" command for this point.

The three COS-status (change of state) bits indicate if an alarm or warning condition exists, as shown below.

Table 10-29 COS status bits

These bits are re-evaluated whenever the status or current value of the Analog Input Point is queried. They are also re-evaluated whenever a "Poll

without Acknowledge" command is received and this point's "COS-enable" bit is set.

It is not possible to "override" the Analog Input Status attribute; the only permissible operation is "Read".

Analog input value

The current value is returned as a 32-bit (4 byte) IEEE floating point number.This attribute may be read and may also optionally be "overridden".

Overriding the Analog Input Value attribute will freeze its value to the specified setting until an "override release" is issued for that point. Analog Inputs

are all read-only so that an "override" command will not change the value in the drive itself.

Attribute Name Format Commands Notes

1 Object Configuration Byte Read, Write Except for point 24 to 28

2 Object Status Byte Read Response returns status and current value

3 Analog Input Value Float Read, Override Response returns status and current value

8 Low alarm Limit Float Read, Write Except for point 24 to 28

9 Low Warning Limit Float Read, Write Except for point 24 to 28

10 High Warning Limit Float Read, Write Except for point 24 to 28

11 High Alarm Limit Float Read, Write Except for point 24 to 28

12 Differential Float Read, Write

Not implemented in this release.

Except for point 24 to 28