Operating Instructions
Chapter 4 - Parameters and Menu Structure
I/O and Hardware (M5)
126 | 187
Siemens Industry, Inc.
Siemens BT300 HVAC Drive
DPD01809
Smart Infrastructure
2019-05-29
Monitoring (M5.8.3.2)
The following monitoring values are available for the N2 fieldbus protocol:
Table 89: N2 Fieldbus Protocol Monitoring.
Menu
Parameter
ID
Min
Max
Description
M5.8.3.2.1
Fieldbus Protocol Status
2399
Initializing
Faulted
Displays the current protocol status as follows:
0 = Initializing
1 = Stopped
2 = Operational
3 = Faulted
M5.8.3.2.2
Communication Status
2400
0.0
99.999
Displays the number of bad frames and good
messages in the following format:
xx.yyy where xx indicates the bad frames and yyy
indicates the good messages.
M5.8.3.2.3
Invalid Data
2041
Active if one or more of the fields in a fieldbus
packet contains a value that is out of the
expected range.
M5.8.3.2.4
Invalid Commands
2402
Displays the number of commands that are not
appropriate for the field or record.
M5.8.3.2.5
Command NACK
2403
Displays the number of negative
acknowledgments due to problems with the
device, so the command was ignored.
M5.8.3.2.6
Control Word
2402
Displays the control word in a bit coded format
as follows:
B0 = Start/Stop
B2 = Fault Reset
M5.8.3.2.7
Status Word
2405
Displays the status word in a bit coded format as
follows:
N2 Point Map
Analog Inputs (AI)
All analog inputs (AI) points have the following features:
● Support Change of State (COS) reporting based on high and low warning limits.
● Support Change of State (COS) reporting based on high and low alarm limits.
● Support Change of State (COS) reporting based on override status.
● Always considered reliable and never out of range.
● Writing alarm and warning limit values beyond the range that can be held by the drive’s internal variable
will result in having the limit replaced by the Invalid Float value even though the message is
acknowledged. The net results will be the inactivation of the alarm or warning (the same as if the original
out of range value was used).
● Overriding is supported from the standpoint that the “Override Active” bit will be set and the value
reported to the N2 network will be the overridden value. However, the value in the drive remains
unchanged. Therefore, the N2 system should be set up to prevent overriding AI point or have an alarm
condition activated when an AI point is overridden.
● Overriding an AI point with a value beyond the limit allowed by the drive’s internal variable will result in an
Invalid Data error and the override status and value will remain unchanged.