Nidec H300 - How a Change-Of-Stage Is Evaluated; Alarms for Analog Inputs; Analog Input Object Configuration Byte;Status Byte; COS Status Bit State Table

Safety
information
Product
information
Mechanical
installation
Electrical
installation
Getting
started
Basic
parameters
Running the
motor
Optimization
NV Media Card
Operation
Building
Automation
Advanced
parameters
Technical
data
Diagnostics
UL listing
information
HVAC Drive H300 193
Issue Number: 3
How a Change-of-State is evaluated
The algorithm used to determine that a point "changed state" and should be included in the COS reply message depends on the point being checked.
Table 10-49 Change of state evaluation
COS is Only Returned Once
When a COS enabled point changes state, this fact is reported only once when the node is "polled". Future COS polls will not return COS data for that
point until it changes state again.
Only COS "Poll Without Acknowledge" Message is Supported
The Control Techniques Metasys protocol handler only supports "Poll without Ack" queries.
Alarm Processing
Alarm processing is available for Analog Input and Binary Input points only. The alarm condition is evaluated only when the point is read via a "read"
command or a "COS" poll.
Alarms for Analog Inputs
The Analog Input point must have alarms and warnings enabled to participate in alarm processing. The alarm and warning enable bits reside in the
Configuration Attribute.
Table 10-50 Analog input object configuration byte
Turning on the "COS enable" bit will also cause the point's alarm/warning status to be evaluated whenever a COS polling message is received.
The alarm information is contained in three COS Status bits of the Analog Input Object Status Byte, as shown below.
Table 10-51 Analog input object status byte
The meaning of the COS Status bits is shown in the following state table:
Table 10-52 COS status bit state table
Overleaf is a depiction of an analog input signal traversing all alarm/warning regions.
Point type Region COS Detection method
Analog Inputs 1
COS detected when “current value” transitions into one of the four alarm/warning regions (high Alarm,
High Warning, Low Warning and Low Alarm) or when “current value” transitions back to Normal.
Binary Inputs 2 COS detected when “current state” bit value changes logic state.
Analog Outputs 3 COS detected when “current value” changes
Binary Outputs 4 COS detected when “current state” bit value changes logic state.
Internal Floats 5 Internal Float Points do not participate in COS operations.
Description Not used Not used Not used
Warning
Enable
Alarm Enable Not used Not used COS Enable
Bit 7 6 5 4 3 2 1 0
Description Not used COS Status 2 COS Status 1 COS Status 0 Not used Not used
Override
active
Reliable /
Unreliable
Bit76543210
COS Status 2 COS Status 1 COS Status 0 Description
0 0 0 Normal – no warning or alarm condition
01 1Low Warning
10 0Low Alarm
1 0 1 High Warning
1 1 0 High Alarm