Nidec H300 - Analog Outputs; Analog Output Point Attributes; Analog Output-Object Configuration Byte; Analog Output-Object Status Byte

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HVAC Drive H300 189

Issue Number: 3

The "Current State" bit is normally the state of the "binary Input" on the drive. If this point is "overridden", then the "Current State" represents the

override value and will remain so until the "Override Release" command is given for this Point.

These bits are re-evaluated whenever the status or current value of the Binary 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.

The Binary Input Status attribute cannot be written to; the only permissible operations is "Read".

10.5.4 Analog Outputs

Analog Output points are floating point drive analog output parameters (float) that are read-write. An Analog Output cannot be written to; but can be

"overridden" if desired. Note that Analog Outputs, being read-write, can be updated on the drive. In this case, overriding an analog output will change

the value on the drive as well as change what the Metasys network sees as the value of that point.

Analog outputs are allocated point numbers in the numerical order in which they are defined on their respective option module.

Table 10-34 Analog Output Points

Each Analog Output point has three attributes that can be read and updated.

Table 10-35 Analog output point attributes

Object Configuration

The Analog Output Object Configuration byte has the following format:

Table 10-36 Analog output- 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.

Object Status

The Analog Output Object Status byte has the following format:

Table 10-37 Analog output- object status byte

The "Reliable/Unreliable" bit will be set if the analog output source is not valid and/or not 16 bit parameter.

The "Override Active" bit will be set if an Analog Output point is overridden. This indicates that the current value being read is an "override" and does

not 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.

These bits are re-evaluated when the status or current value of the Analog Output 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.

The Analog Output Status attribute cannot be written to; the only permissible operation is "Read".

Point Parameter Description Access

0Pr 01.021 Preset Speed # 1 RW

1Pr 01.006 Maximum reference clamp RW

2Pr 10.038 User trip RW

3Pr 06.021 Time between Filter Changes RW

4Pr 14.025 PID 1 Digital Reference RW

5Pr 14.026 PID 1 Digital Feedback RW

6Pr 14.055 PID 2 Digital Reference RW