Operating and Maintenance Instructions
210-OMI14229-Iss8.1
CN1116 Full OMI
Page 37 of 47
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Appendix F
–
Modbus Holding Registers for Individual Fan Monitoring
These Modbus registers contain the same individual fan parameter values as shown on the LCD display. A
“2
Fan Array”
is used as an example in the table below. This set of registers scales up and down depending on the
total connected fans:
Parameter
Nº
ADDR
(hex)
DESCRIPTION (Locally Stored Registers)
Parameter 1
CB00
FAN 1 - FAN STATUS (0= No Comms, 1= Healthy, 2= Alarm, 3= Warning)
CB01
FAN 2 - FAN STATUS (0= No Comms, 1= Healthy, 2= Alarm, 3= Warning)
Parameter 2
CB02
FAN 1
–
ALARM REGISTER *
CB03
FAN 2
–
ALARM REGISTER *
Parameter 3
CB04
FAN 1
–
WARNING REGISTER *
CB05
FAN 2
–
WARNING REGISTER *
Parameter 4
CB06
FAN 1 - POWER (W)
CB07
FAN 2 - POWER (W)
Parameter 5
CB08
FAN 1 - SPEED (RPM)
CB09
FAN 2 - SPEED (RPM)
Parameter 6
CB0A
FAN 1 - RPM LIMIT (RPM)
CB0B
FAN 2 - RPM LIMIT (RPM)
Parameter 7
CB0C
FAN 1 - MOTOR TEMPERATURE (ºC)
CB0D
FAN 2 - MOTOR TEMPERATURE (ºC)
Parameter 8
CB0E
FAN 1 - ELECTRONICS TEMPERATURE (ºC)
CB0F
FAN 2 - ELECTRONICS TEMPERATURE (ºC)
Parameter 9
CB10
FAN 1 - HOURS RUN (hours)
CB11
FAN 2 - HOURS RUN (hours)
Parameter
10
CB12
FAN 1
–
SPEED SETPOINT (0-100%)
CB13
FAN 2
–
SPEED SETPOINT (0-100%)
Parameter
11
CB14
FAN 1 - SENSOR READING HIGH (0-65535)
**
CB15
FAN 1 - SENSOR READING LOW (0-65535)
**
CB16
FAN 2 - SENSOR READING HIGH (0-65535)
**
CB17
FAN 2 - SENSOR READING LOW (0-65535)
**
Table 8
–
Controller’s Dedicated
Modbus Holding Registers Part 2
* See Table 9 below for information about the fan alarm and fan warning registers
**
Parameter 11 is the “Sensor Reading” which is a 32
-bit value comprised of two 16-bit (high and low) values. This parameter is only
available when using the fan as a sensor input
For parameters 1 to 10, the equation below can be used to derive the Modbus Address (in decimal):
Modbus Address = 51967 + (Parameter Number * Total Fans) - (Total Fans
–
Fan Number)
For parameter 11, the following equations can be used to derive the Modbus Address (in decimal) of the high and low components for
each fan:
Modbus Address Sensor Reading High = 51967 + (10 * Total Fans) + (Fan Number * 2) - 1
Modbus Address Sensor Reading Low = 51967 + (10 * Total Fans) + (Fan Number * 2)
NOTE: Do not to read/write more than 14 consecutive registers at a time, otherwise a Modbus
Exception Response will occur.
